Masked sdk key

[kp-cat]

Describe the purpose of your pull request

• Mask the sdk key in logs
• Sample sdk key update
• Requirements cleanup

Requirement checklist (only if applicable)

• I have covered the applied changes with automated tests.
• I have executed the full automated test set against my changes.
• I have validated my changes against all supported platform versions.
• I have read and accepted the contribution agreement.

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.53%. Comparing base (7ebc128) to head (d5cd09a).

Additional details and impacted files

@@           Coverage Diff           @@
##           master      #44   +/-   ##
=======================================
  Coverage   98.52%   98.53%           
=======================================
  Files          40       40           
  Lines        3324     3340   +16     
=======================================
+ Hits         3275     3291   +16     
  Misses         49       49           

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[adams85]

For consistency with other SDKs, could you update the message for error 1100 to also include the masked SDK Key?

Sample: https://github.com/configcat/js-unified-sdk/blob/v1.1.0/src/ConfigCatLogger.ts#L212