docs: document VCDM 1.1 alignment and API changes

[yshyn-iohk]

Description:

• added documentation for API changes and alignment with VDCM 1.1, fixes #identus-docs/issues/202

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]

Integration Test Results

 23 files  ±0   23 suites  ±0   3s ⏱️ ±0s
 56 tests ±0   56 ✅ ±0  0 💤 ±0  0 ❌ ±0 
103 runs  ±0  103 ✅ ±0  0 💤 ±0  0 ❌ ±0 

Results for commit 774b898. ± Comparison against base commit d16da04.

♻️ This comment has been updated with latest results.

[github-actions]

Unit Test Results

105 files  ±0  105 suites  ±0   20m 22s ⏱️ + 1m 11s
889 tests ±0  881 ✅ ±0  8 💤 ±0  0 ❌ ±0 
896 runs  ±0  888 ✅ ±0  8 💤 ±0  0 ❌ ±0 

Results for commit 774b898. ± Comparison against base commit d16da04.

[coveralls]

coverage: 48.657%. remained the same
when pulling 774b898 on docs/vcdm1_1
into d16da04 on main.