Configure HTTP methods to capture in WSGI middleware and frameworks

[antonpirker]

• Do not capture transactions for OPTIONS and HEAD HTTP methods by default.
• Make it possible with an http_methods_to_capture config option for Django and Flask, to specify what HTTP methods to capture.

Fixes #3528

Docs PR:
getsentry/sentry-docs#11348

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 84.23%. Comparing base (e6ca5a2) to head (e617183).

✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #3531   +/-   ##
=======================================
  Coverage   84.22%   84.23%           
=======================================
  Files         136      136           
  Lines       13900    13914   +14     
  Branches     2940     2943    +3     
=======================================
+ Hits        11707    11720   +13     
  Misses       1465     1465           
- Partials      728      729    +1     

Files with missing lines	Coverage Δ
sentry_sdk/integrations/_wsgi_common.py	84.40% <100.00%> (+0.14%)	⬆️
sentry_sdk/integrations/django/__init__.py	84.84% <100.00%> (+0.08%)	⬆️
sentry_sdk/integrations/flask.py	87.09% <100.00%> (+0.21%)	⬆️
sentry_sdk/integrations/wsgi.py	95.45% <100.00%> (+0.33%)	⬆️

... and 2 files with indirect coverage changes