Feat implement Run APIs (sashabaranov#560)

* chore: first commit

* add apis

* chore: add tests

* feat add apis

* chore: add api and tests

* chore: add tests

* fix

* trigger build

* fix

* chore: formatting code

* chore: add pagination type

fix test server setup: (sashabaranov#549)

* fix test server setup:
- go map access is not deterministic
- this can lead to a route: /foo/bar/1 matching /foo/bar before matching /foo/bar/1 if the map iteration go through /foo/bar first since the regex match wasn't bound to start and end anchors
- registering handlers now converts * in routes to .* for proper regex matching
- test server route handling now tries to fully match the handler route

* add missing /v1 prefix to fine-tuning job cancel test server handler

test: fix compile error in api integration test (sashabaranov#548)

fix: use pointer for ChatCompletionResponseFormat (sashabaranov#544)

Feat Support tools and tools choice new fileds (sashabaranov#526)

* feat: support tools and tools choice new fileds

* fix: use value not pointers

Feat Implement assistants API (sashabaranov#535)

* chore: implement assistants API

* fix

* fix

* chore: add tests

* fix tests

* fix linting

Fix typo in README: AdaEmbeddingV2 (sashabaranov#516)

Copy-pasting the old sample caused compilation errors

Support get http header and x-ratelimit-* headers (sashabaranov#507)

* feat: add headers to http response

* feat: support rate limit headers

* fix: go lint

* fix: test coverage

* refactor streamReader

* refactor streamReader

* refactor: NewRateLimitHeaders to newRateLimitHeaders

* refactor: RateLimitHeaders Resets filed

* refactor: move RateLimitHeaders struct

added delete fine tune model endpoint (sashabaranov#497)

Chore Support base64 embedding format (sashabaranov#485)

* chore: support base64 embedding format

* fix: add sizeOfFloat32

* chore: refactor base64 decoding

* chore: add tests

* fix linting

* fix test

* fix return error

* fix: use smaller slice for tests

* fix [skip ci]

* chore: refactor test to consider CreateEmbeddings response

* trigger build

* chore: remove named returns

* chore: refactor code to simplify the understanding

* chore: tests have been refactored to match the encoding format passed by request

* chore: fix tests

* fix

* fix