Add new tab Cardano Stake Distribution in the explorer

[dlachaume]

Content

This PR includes an update to mithril-explorer that implements a new tab, which displays the Cardano Stake Distribution list only when the signed entity type is advertised by the aggregator.

Pre-submit checklist

• Branch
  • Tests are provided (if possible)
  • Crates versions are updated (if relevant)
  • CHANGELOG file is updated (if relevant)
  • Commit sequence broadly makes sense
  • Key commits have useful messages
• PR
  • No clippy warnings in the CI
  • Self-reviewed the diff
  • Useful pull request description
  • Reviewer requested
• Documentation
  • Update README file (if relevant)
  • Update documentation website (if relevant)
  • Add dev blog post (if relevant)

Issue(s)

Closes #1843

[github-actions]

Test Results

    4 files  ±0     53 suites  ±0   9m 19s ⏱️ -2s
1 242 tests ±0  1 242 ✅ ±0  0 💤 ±0  0 ❌ ±0 
1 450 runs  ±0  1 450 ✅ ±0  0 💤 ±0  0 ❌ ±0 

Results for commit b76f23a. ± Comparison against base commit 7b8579b.

♻️ This comment has been updated with latest results.