Python-helpscout

Added
- Type hints for most functions
Changed
- Now requires Python 3.11+

Changed
- When requesting a single resource using the dictionary way, only a single
object will be returned instead of a list with a single object.

Fixed
- Correctly return entities when a single one is requested using a resource id
reflecting changes in HelpScout's API responses.

Changed
- HelpScoutEndpointRequester now returns subentities for methods named other
than http methods like get / post / put / delete / etc.
- HelpScoutEndpointRequester can now be accessed as a dictionary to request
specific resources or specific resources sub endpoints (like a conversation's
tags).
- The client's *hit* method has been renamed to *hit_* and *hit* nows nexts the
generator.

Fixed
- Setting attributes to HelpScout objects adds them to the attributes list.

Fixed
- Send json data actually as json.