feat(openapi): write openapi generator template

The template is mostly canibalized from the openapi-generator repository so full credits to them:
https://github.com/OpenAPITools/openapi-generator.

Author: AntoineDao

.openapi-generator/config.json

@@ -0,0 +1,5 @@
+{
+  "packageName": "pollination_sdk",
+  "projectName": "pollination-sdk",
+  "packageUrl": "https://github.com/pollination/python-sdk"
+}

.openapi-generator/generate.sh

@@ -0,0 +1,9 @@
+#!/bin/bash
+
+npx openapi-generator generate \
+  -i https://api.pollination.cloud/sdk_openapi.json \
+  -t .openapi-generator/templates/python \
+  -g python \
+  -o . \
+  --skip-validate-spec \
+  -c .openapi-generator/config.json

.openapi-generator/templates/python/.github/workflows/continuous-integration.yaml

@@ -0,0 +1,21 @@
+name: CD
+
+on:
+  release:
+    types: [published]
+
+jobs:
+  deploy:
+    name: "Deploy to PyPi server"
+    runs-on: ubuntu-latest
+
+    steps:
+    - uses: actions/checkout@v1
+#     - name: Publish package to TestPyPI
+#       uses: pypa/gh-action-pypi-publish@master
+#       with:
+#         user: ${{ secrets.PYPI_USER }}
+#         password: ${{ secrets.PYPI_PASSWORD }}
+#         repository_url: https://some.private.repo.org/legacy/
+
+# Change values above once a private repo has been set up

.openapi-generator/templates/python/README.mustache

@@ -0,0 +1,62 @@
+# {{{projectName}}}
+
+{{#appDescription}}
+{{{appDescription}}}
+{{/appDescription}}
+
+This Python package is automatically generated by the [OpenAPI Generator](https://openapi-generator.tech) project:
+
+- API version: {{appVersion}}
+{{^hideGenerationTimestamp}}
+- Build date: {{generatedDate}}
+{{/hideGenerationTimestamp}}
+- Build package: {{generatorClass}}
+{{#infoUrl}}
+For more information, please visit [{{{infoUrl}}}]({{{infoUrl}}})
+{{/infoUrl}}
+
+## Requirements
+
+Python 2.7 and 3.4+
+
+## Installation & Usage
+
+### pip install
+
+The default way to install `{{{projectName}}}` is through PyPi as follows:
+
+```sh
+pip install {{{projectName}}}
+```
+
+If you need a specific branch you can install straight from the repository using:
+
+```sh
+pip install git+https://{{gitHost}}/{{{gitUserId}}}/{{{gitRepoId}}}.git
+```
+(you may need to run `pip` with root permission: `sudo pip install git+https://{{gitHost}}/{{{gitUserId}}}/{{{gitRepoId}}}.git`)
+
+Then import the package:
+```python
+import {{{packageName}}} 
+```
+
+### Setuptools
+
+Install via [Setuptools](http://pypi.python.org/pypi/setuptools).
+
+```sh
+python setup.py install --user
+```
+(or `sudo python setup.py install` to install the package for all users)
+
+Then import the package:
+```python
+import {{{packageName}}}
+```
+
+## Getting Started
+
+Please follow the [installation procedure](#installation--usage) and then run the following:
+
+{{> common_README }}

.openapi-generator/templates/python/README_onlypackage.mustache

@@ -0,0 +1,44 @@
+# {{{projectName}}}
+{{#appDescription}}
+{{{appDescription}}}
+{{/appDescription}}
+
+The `{{packageName}}` package is automatically generated by the [OpenAPI Generator](https://openapi-generator.tech) project:
+
+- API version: {{appVersion}}
+- Package version: {{packageVersion}}
+{{^hideGenerationTimestamp}}
+- Build date: {{generatedDate}}
+{{/hideGenerationTimestamp}}
+- Build package: {{generatorClass}}
+{{#infoUrl}}
+For more information, please visit [{{{infoUrl}}}]({{{infoUrl}}})
+{{/infoUrl}}
+
+## Requirements.
+
+Python 2.7 and 3.4+
+
+## Installation & Usage
+
+This python library package is generated without supporting files like setup.py or requirements files
+
+To be able to use it, you will need these dependencies in your own package that uses this library:
+
+* urllib3 >= 1.15
+* six >= 1.10
+* certifi
+* python-dateutil
+{{#asyncio}}
+* aiohttp
+{{/asyncio}}
+{{#tornado}}
+* tornado>=4.2,<5
+{{/tornado}}
+
+## Getting Started
+
+In your own code, to use this library to connect and interact with {{{projectName}}},
+you can run the following:
+
+{{> common_README }}

.openapi-generator/templates/python/__init__.mustache

@@ -0,0 +1,7 @@
+from __future__ import absolute_import
+
+# flake8: noqa
+
+# import apis into api package
+{{#apiInfo}}{{#apis}}from {{apiPackage}}.{{classVarName}} import {{classname}}
+{{/apis}}{{/apiInfo}}

.openapi-generator/templates/python/__init__api.mustache

@@ -0,0 +1,10 @@
+# coding: utf-8
+
+# flake8: noqa
+{{>partial_header}}
+
+from __future__ import absolute_import
+
+# import models into model package
+{{#models}}{{#model}}from {{modelPackage}}.{{classFilename}} import {{classname}}{{/model}}
+{{/models}}

.openapi-generator/templates/python/__init__model.mustache

@@ -0,0 +1,24 @@
+# coding: utf-8
+
+# flake8: noqa
+
+{{>partial_header}}
+
+from __future__ import absolute_import
+
+__version__ = "{{packageVersion}}"
+
+# import apis into sdk package
+{{#apiInfo}}{{#apis}}from {{apiPackage}}.{{classVarName}} import {{classname}}
+{{/apis}}{{/apiInfo}}
+# import ApiClient
+from {{packageName}}.api_client import ApiClient
+from {{packageName}}.configuration import Configuration
+from {{packageName}}.exceptions import OpenApiException
+from {{packageName}}.exceptions import ApiTypeError
+from {{packageName}}.exceptions import ApiValueError
+from {{packageName}}.exceptions import ApiKeyError
+from {{packageName}}.exceptions import ApiException
+# import models into sdk package
+{{#models}}{{#model}}from {{modelPackage}}.{{classFilename}} import {{classname}}
+{{/model}}{{/models}}