feat: pollus JWT to support KID parameter

[cristianIOHK]

Description:

This PR adds support for KID parameter to the JWT sign process as part of the header.

BREAKING CHANGE: Pollux methods changed to suspend as they have network calls on them.
processCredentialRequestJWT and processCredentialRequestSDJWT

Checklist:

• My PR follows the contribution guidelines of this project
• My PR is free of third-party dependencies that don't comply with the Allowlist
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• I have added tests that prove my fix is effective or that my feature works
• I have checked the PR title to follow the conventional commit specification

[github-actions]

Unit Test Results

151 tests  +1   148 ✅ +1   6s ⏱️ -1s
 26 suites ±0     3 💤 ±0 
 26 files   ±0     0 ❌ ±0 

Results for commit 78e72c6. ± Comparison against base commit 93d21c8.

♻️ This comment has been updated with latest results.