Create an easy way to run all the samples

[markmark206]

Create make target to run all the samples, given a frontend endpoint (e. g. FRONTEND_ADDRESS=127.0.0.1:7233 make run). Integrate it with #15.

This will enable two use cases:

1. a dev making change on their machine, and wanting to make sure things still work before submitting a PR
2. CI/CD pipeline running samples against a staging environment as part of its validation of the repo (and, indirectly, of the code deployed to the staging environment).

[alexshtin]

This might not be needed if we implement #34 correctly.

[vitarb]

Closed as a duplicate