feat: support batches api (#746)

* feat: support batches api

* update batch_test.go

* fix golangci-lint check

* fix golangci-lint check

* fix tests coverage

* fix tests coverage

* fix tests coverage

* fix tests coverage

* fix tests coverage

* fix tests coverage

* fix tests coverage

* fix: create batch api

* update batch_test.go

* feat: add `CreateBatchWithUploadFile`

* feat: add `UploadBatchFile`

* optimize variable and type naming

* expose `BatchLineItem` interface

* update batches const

client_test.go

@@ -396,6 +396,17 @@ func TestClientReturnsRequestBuilderErrors(t *testing.T) {
 		{"CreateSpeech", func() (any, error) {
 			return client.CreateSpeech(ctx, CreateSpeechRequest{Model: TTSModel1, Voice: VoiceAlloy})
 		}},
+		{"CreateBatch", func() (any, error) {
+			return client.CreateBatch(ctx, CreateBatchRequest{})
+		}},
+		{"CreateBatchWithUploadFile", func() (any, error) {
+			return client.CreateBatchWithUploadFile(ctx, CreateBatchWithUploadFileRequest{})
+		}},
+		{"RetrieveBatch", func() (any, error) {
+			return client.RetrieveBatch(ctx, "")
+		}},
+		{"CancelBatch", func() (any, error) { return client.CancelBatch(ctx, "") }},
+		{"ListBatch", func() (any, error) { return client.ListBatch(ctx, nil, nil) }},
 	}
 
 	for _, testCase := range testCases {