Improve handling of JSON Schema in OpenAI API Response Context (#819)

* feat: add jsonschema.Validate and jsonschema.Unmarshal

* fix Sanity check

* remove slices.Contains

* fix Sanity check

* add SchemaWrapper

* update api_integration_test.go

* update method 'reflectSchema' to support 'omitempty' in JSON tag

* add GenerateSchemaForType

* update json_test.go

* update `Warp` to `Wrap`

* fix Sanity check

* fix Sanity check

* update api_internal_test.go

* update README.md

* update README.md

* remove jsonschema.SchemaWrapper

* remove jsonschema.SchemaWrapper

* fix Sanity check

* optimize code formatting

chat.go

@@ -5,8 +5,6 @@ import (
 	"encoding/json"
 	"errors"
 	"net/http"
-
-	"github.com/sashabaranov/go-openai/jsonschema"
 )
 
 // Chat message role defined by the OpenAI API.
@@ -187,10 +185,10 @@ type ChatCompletionResponseFormat struct {
 }
 
 type ChatCompletionResponseFormatJSONSchema struct {
-	Name        string                `json:"name"`
-	Description string                `json:"description,omitempty"`
-	Schema      jsonschema.Definition `json:"schema"`
-	Strict      bool                  `json:"strict"`
+	Name        string         `json:"name"`
+	Description string         `json:"description,omitempty"`
+	Schema      json.Marshaler `json:"schema"`
+	Strict      bool           `json:"strict"`
 }
 
 // ChatCompletionRequest represents a request structure for chat completion API.