feat(GenerationContext.py): add new file GenerationContext.py to handle the context of generation engines

feat(OpenaiLLMEngine.py): add orjson library for JSON serialization and deserialization, and implement the generate method to make API call to OpenAI chat completions endpoint

feat(__init__.py): import OpenaiLLMEngine in LLMEngine package

feat(BaseScriptEngine.py): add time_script method to the BaseScriptEngine class

feat(CustomScriptEngine.py): add new file CustomScriptEngine.py to handle custom script generation, implement generate method to return the provided script, and add get_options method to provide a textbox for the prompt input

feat(__init__.py): import CustomScriptEngine in ScriptEngine package

feat(__init__.py): import LLMEngine package and add OpenaiLLMEngine to the ENGINES dictionary

refactor(gradio_ui.py): change equal_height attribute of Row to False to allow different heights for input blocks

src/engines/__init__.py

@@ -1,8 +1,10 @@
 from . import TTSEngine
 from .BaseEngine import BaseEngine
 from . import ScriptEngine
+from . import LLMEngine
 
 ENGINES = {
+    "LLMEngine": [LLMEngine.OpenaiLLMEngine],
     "TTSEngine": [TTSEngine.CoquiTTSEngine, TTSEngine.ElevenLabsTTSEngine],
-    "ScriptEngine": [ScriptEngine.ShowerThoughtsScriptEngine],
+    "ScriptEngine": [ScriptEngine.ShowerThoughtsScriptEngine, ScriptEngine.CustomScriptEngine],
 }