Fixed #22058 -- Refactored handlers and added a generic mechanism to deal with client and server errors.

**What is done**:

- Refactored handlers into generic ones.
- Deprecated original default views.
- Added generic views.

**Improvements Required**:
- Docs build have several warnings due to removing original handlers.
- A writeup for new views.

**Suggestions**:
- We could add two generic exceptions also: `HttpClientException` and `HttpServerException` to add onto the functionality.

how about `_resolve_special` -> `resolve_error_handler()`. I don't see a need for separate methods like `resolve4XX` and `resolve5XX`, especially when you pass any status code to either and achieve the same result.