### Motivation / Context
When exploring `load_tools(["requests"] )`, I would have expected all
request method tools to be imported instead of just `RequestsGetTool`.
### Changes
Break `_get_requests` into multiple functions by request method. Each
function returns the `BaseTool` for that particular request method.
In `load_tools`, if the tool name "requests_all" is encountered, we
replace with all `_BASE_TOOLS` that starts with `requests_`.
This way, `load_tools(["requests"])` returns:
- RequestsGetTool
- RequestsPostTool
- RequestsPatchTool
- RequestsPutTool
- RequestsDeleteTool
Mandy Gu
c841b2cc51