Allow customization of the WWW-Authenticate headers

[nagyesta]

Issue: #1149

Description

• Adds new properties to allow customization of the WWW-Authenticate header
• Changes the CommonAuthHeaderFilter to support custom resource URIs
• Uses default value of the LOWKEY_AUTH_RESOURCE property to keep existing logic in place
• Changes token endpoint to return WWW-Authenticate headers as well
• Allows configuration of the realm used by the token endpoint using LOWKEY_TOKEN_REALM
• Updates tests
• Updates documentation

Entry point

Checklists

• I have rebased my branch
• My commit message is meaningful
• The commit messages use semantic versioning: {major}, {minor} or {patch}
• The changes are focusing on the issue at hand
• I have maintained or increased test coverage

Notes

• Uses the first commit as-is from the Make WWW-Authenticate header resource parameter configurable #1150 PR opened by @craig0990 (Thank you!) . This new PR was only necessary to allow successful test runs using the pipeline and incorporate my own adjustments.

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 98.96%. Comparing base (6c5c13e) to head (02f44d3).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##               main    #1151   +/-   ##
=========================================
  Coverage     98.96%   98.96%           
- Complexity     2019     2024    +5     
=========================================
  Files           239      239           
  Lines          4926     4936   +10     
  Branches        193      194    +1     
=========================================
+ Hits           4875     4885   +10     
  Misses           38       38           
  Partials         13       13           

Flag	Coverage Δ
app	99.36% <100.00%> (+<0.01%)	⬆️
client	94.00% <ø> (ø)
testcontainers	97.81% <ø> (ø)

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