fix(types): update type hints in web3._utils.method_formatters.py

[BobTheBuidler]

What was wrong?

get_result_formatters had return type Dict[str, Callable[..., Any]] which is incorrect because the function returns a callable toolz.compose object

get_error_formatters, and get_null_result_formatters both had return type Callable[..., Any] which is techincally correct but could be made more specific for clarity for contributors.

Related to Issue #N/A
Closes #N/A

How was it fixed?

I've changed the return type for all 3 functions to Callable[[RPCResponse], Any].

Todo:

• Clean up commit history
• Add or update documentation related to these changes

I did not add an entry to release notes as this change is not relevant for users.

Cute Animal Picture

[BobTheBuidler]

Is method_name actually supposed to be a Union[RPCEndpoint, Callable[..., RPCEndpoint]]?

I notice Union[RPCEndpoint, Callable[..., RPCEndpoint]] is used throughout the codebase but the code itself seems to assume method_name is always a string value, never callable. Should this be updated as well?

[kclowes]

Oh, nice catch. Yeah, these can only be RPCEndpoints once they're here.

[BobTheBuidler]

Now that you've merged #3665 and #3666 I rebased my branch on master and reran the tests, looks like everything passes now

[kclowes]

Curious about the reasoning behind this change?

[BobTheBuidler]

This change just indicates to mypy that the function will work with any iterable of callables.

The original hint indicates that the function must take a tuple input, so while it didn't cause any type errors internally here it can cause unneeded type errors for downstream users.

[kclowes]

Oh, nice catch. Yeah, these can only be RPCEndpoints once they're here.