refactor(http/unstable): improve route() method matching

[tomas-zijdemans]

• routes without method now match any HTTP method (like Hono)
• case-insensitive method matching ("post" works the same as "POST")
• params in handler is no longer optional.
• fixed typo in doc
• updated tests

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 94.20%. Comparing base (e80e6bb) to head (4519c62).
⚠️ Report is 13 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6990      +/-   ##
==========================================
- Coverage   94.26%   94.20%   -0.06%     
==========================================
  Files         602      613      +11     
  Lines       43662    47713    +4051     
  Branches     7063     8299    +1236     
==========================================
+ Hits        41159    44950    +3791     
- Misses       2447     2696     +249     
- Partials       56       67      +11     

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[kt3k]

Makes sense to me

ref #5772