refacto(cors): use manageHeaders for CORS headers

[p-j]

• @p-j/eapi-middleware-headers
  • export utility functions to handle header values
  • ignore header with empty values
• @p-j/eapi-middleware-cors
  • use utility functions to handle CORS headers
  • update tests accordingly

[changeset-bot]

🦋 Changeset detected

Latest commit: 0b9192c

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 2 packages

Name	Type
@p-j/eapi-middleware-cors	Minor
@p-j/eapi-middleware-headers	Minor

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[codecov]

Codecov Report

Merging #16 (0b9192c) into main (c1965d6) will decrease coverage by 0.04%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##             main      #16      +/-   ##
==========================================
- Coverage   98.71%   98.67%   -0.05%     
==========================================
  Files           7        7              
  Lines         156      151       -5     
  Branches       62       62              
==========================================
- Hits          154      149       -5     
  Misses          2        2              

Impacted Files	Coverage Δ
packages/eapi-middleware-cors/src/withCors.ts	100.00% <100.00%> (ø)
...ackages/eapi-middleware-headers/src/withHeaders.ts	100.00% <100.00%> (ø)

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