Generate unique operation id with multiple methods (Fixes #4740)

[bruchar1]

When providing multiple methods on a single route, the same operation id is generated on routes for each methods, using the first method in the list.

This PR adds a different route for each method, ensuring the proper method name is used for generating the operation id.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Comparison is base (cf73051) 100.00% compared to head (fbe1b2e) 100.00%. Report is 1038 commits behind head on master.

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Additional details and impacted files

@@            Coverage Diff            @@
##            master     #4851   +/-   ##
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  Coverage   100.00%   100.00%           
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  Files          540       540           
  Lines        13969     13962    -7     
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- Hits         13969     13962    -7     

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📝 Docs preview for commit 86dcc65f3a81d3c46e93e086dc263f6ec4510a37 at: https://626fe66ba152cf4199375d66--fastapi.netlify.app

[github-actions[bot]]

📝 Docs preview for commit adb93a7dd2e63f273b6bd9beec8131f5c1bee03d at: https://626fe85427fc404c2b356063--fastapi.netlify.app

[github-actions[bot]]

📝 Docs preview for commit fbe1b2e8d802e8178aa7096decc0c61aa2086469 at: https://631e525fb9acb87b275ae2d7--fastapi.netlify.app

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📝 Docs preview for commit ecc913ad090d88b907c5254f7be367a99df43363 at: https://639cd642712b181a594d7c61--fastapi.netlify.app

[phillipuniverse]

@bruchar1 I pulled this in locally to work with an @router.api_route decorator and it works perfectly! Thanks for the fix!