feat: add issues support in serializer and createHttpException

[belgattitude]

Add support for HttpUnprocessableEntity.issues in serializer.

import { fromJson, toJson } from '@httpx/exception/serializer';

const e422 = new HttpUnprocessableEntity({
    message: 'Validation failed',
    issues: [
        {
            message: 'Invalid address',
            path: ['addresses', 0, 'line1'],
            code: 'empty_string',
        },
    ],
});

const json = toJson(e422);
const js = fromJson(json);

expect((js as HttpUnprocessableEntity).issues).toStrictEqual(e422.issues);
expect(js).toStrictEqual(e422);

And Fix createHttpException that wasn't allowing issues on HttpUnprocessableEntity

const e422 = createHttpException(422, {
    message: 'Validation failed',
    issues: [
        {
            message: 'Invalid address',
            path: ['addresses', 0, 'line1'],
            code: 'empty_string',
        },
    ],
});

[changeset-bot]

🦋 Changeset detected

Latest commit: 57e06d1

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 3 packages

Name	Type
@httpx/exception	Minor
@examples/nextjs-app	Patch
@httpx/json-api	Patch

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[codecov]

Codecov Report

Merging #675 (57e06d1) into main (5ed840e) will increase coverage by 2.31%.
The diff coverage is 100.00%.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #675      +/-   ##
==========================================
+ Coverage   90.87%   93.18%   +2.31%     
==========================================
  Files          74       74              
  Lines         482      484       +2     
  Branches      118      119       +1     
==========================================
+ Hits          438      451      +13     
+ Misses         38       28      -10     
+ Partials        6        5       -1     

Flag	Coverage Δ
httpx-dsn-parser-unit	100.00% <ø> (ø)
httpx-exception-unit	95.25% <100.00%> (+3.31%)	⬆️
httpx-json-api-unit	66.00% <ø> (ø)

Files	Coverage Δ
...es/exception/src/client/HttpUnprocessableEntity.ts	100.00% <ø> (ø)
...kages/exception/src/factory/createHttpException.ts	100.00% <100.00%> (ø)
...ion/src/serializer/mapper/convertToSerializable.ts	95.45% <100.00%> (+0.21%)	⬆️
...on/src/serializer/mapper/createFromSerializable.ts	92.30% <100.00%> (+0.20%)	⬆️

... and 2 files with indirect coverage changes