Feature: allow parsing webhook with event name of type str

[fau-st]

When calling the parse functions for webhooks, we don't always control where the name parameter comes from.
In my case, I retrieve it from a HTTP request's header and the type is simply str:

name: str = headers['X-GitHub-Event']
event = parse(name, b"")

And pyright complains with the following:
error: Type of "event" is unknown (reportUnknownVariableType)
error: No overloads for "parse" match the provided arguments (reportCallIssue)

However, since parse and parse_obj check for name to be part of VALID_EVENT_NAMES it looks safe to me to allow for plain str to be passed.

Let me know what you think.

[yanyongyu]

I did miss the str type case. Thanks for your pr 😄

[codecov]

Codecov Report

Attention: Patch coverage is 50.00000% with 2 lines in your changes missing coverage. Please review.

Project coverage is 17.65%. Comparing base (4f2e025) to head (cc9ac27).

Files	Patch %	Lines
...t/versions/ghec_v2022_11_28/webhooks/_namespace.py	0.00%	2 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #123   +/-   ##
=======================================
  Coverage   17.65%   17.65%           
=======================================
  Files        4800     4800           
  Lines      222706   222706           
=======================================
  Hits        39316    39316           
  Misses     183390   183390           

Flag	Coverage Δ
unittests	17.65% <50.00%> (ø)

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