refactor(forge): Clean forge (#7117)

Remove unused `forge` code and improve structure of `forge`.

* Put all Agent Protocol stuff together in `forge.agent_protocol`
  * ... including `forge.agent_protocol.database` (was `forge.db`)
* Remove duplicate/unused parts from `forge`
  * `forge.actions`, containing old commands; replaced by `forge.components` from `autogpt`
  * `forge/agent.py` (the old one, `ForgeAgent`)
  * `forge/app.py`, which was used to serve and run the `ForgeAgent`
  * `forge/db.py` (`ForgeDatabase`), which was used for `ForgeAgent`
  * `forge/llm.py`, which has been replaced by new `forge.llm` module which was ported from `autogpt.core.resource.model_providers`
  * `forge.memory`, which is not in use and not being maintained
  * `forge.sdk`, much of which was moved into other modules and the rest is deprecated
  * `AccessDeniedError`: unused
  * `forge_log.py`: replaced with `logging`
  * `validate_yaml_file`: not needed
  * `ai_settings_file` and associated loading logic and env var `AI_SETTINGS_FILE`: unused
  * `prompt_settings_file` and associated loading logic and env var `PROMPT_SETTINGS_FILE`: default directives are now provided by the `SystemComponent`
    * `request_user_double_check`, which was only used in `AIDirectives.load`
  * `TypingConsoleHandler`: not used

.gitignore

@@ -6,8 +6,6 @@ auto_gpt_workspace/*
 *.mpeg
 .env
 azure.yaml
-ai_settings.yaml
-last_run_ai_settings.yaml
 .vscode
 .idea/*
 auto-gpt.json