…rays (#381) (#384)

* fix: chat stream resp has 'data: ' prefix

* fix: lint error

* fix: lint error

* fix: lint error

* feat: use json.rawMessage, test functions

* chore: lint

* fix: tests

the ChatCompletion mock server doesn't actually run otherwise. N=0
is the default request but the server will treat it as n=1

* fix: tests should default to n=1 completions

* chore: add back removed interfaces, custom marshal

* chore: lint

* chore: lint

* chore: add some tests

* chore: appease lint

* clean up JSON schema + tests

* chore: lint

* feat: remove backwards compatible functions

for illustrative purposes

* fix: revert params change

* chore: use interface{}

* chore: add test

* chore: add back FunctionDefine

* chore: /s/interface{}/any

* chore: add back jsonschemadefinition

* chore: testcov

* chore: lint

* chore: remove pointers

* chore: update comment

* chore: address CR

added test for compatibility as well

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Co-authored-by: James <[email protected]>