fix(validation): match content-type with MIME parameters

[fredbi]

consumes entries that carry MIME parameters (e.g. text/plain;charset=utf-8) were rejecting all client content types because validation compared the bare parsed media type against the raw allowed string. Parse both sides and accept when the bare types match and every client parameter is present on the allowed entry with the same value (allowed entry may carry extra parameters; an entry without parameters accepts any).

Fixes #136

Change type

Please select: 🆕 New feature or enhancement|🔧 Bug fix'|📃 Documentation update

Short description

Fixes

Full description

Checklist

• I have signed all my commits with my name and email (see DCO. This does not require a PGP-signed commit
• I have rebased and squashed my work, so only one commit remains
• I have added tests to cover my changes.
• I have properly enriched go doc comments in code.
• I have properly documented any breaking change.

[codecov]

Codecov Report

❌ Patch coverage is 91.66667% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 81.71%. Comparing base (dd5f9c7) to head (3215b9f).
✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
middleware/validation.go	91.66%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #426      +/-   ##
==========================================
+ Coverage   81.69%   81.71%   +0.02%     
==========================================
  Files          50       50              
  Lines        3381     3397      +16     
==========================================
+ Hits         2762     2776      +14     
- Misses        507      508       +1     
- Partials      112      113       +1     

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