feat: Dropping support of BLS

[pbukva]

Proposed changes

Dropping support for BLS. It might need to be merged back when switching to Cosmos-SDK v0.47.x (due to groups module)

Issues

Types of changes

• Bugfix (non-breaking change that fixes an issue)
• New feature (non-breaking change that adds functionality)
• Breaking change (fix or feature that would cause existing functionality to stop working as expected)
• Something else (e.g. tests, scripts, example, deployment, infrastructure, ...)

Checklist

• I have read the CONTRIBUTING document.
• I have based my branch, and I am making a pull request against, the main branch.
• Checks and tests pass locally.

If applicable

• I have added tests that prove my fix is effective or that my feature works.
• I have checked that code coverage does not decrease.
• I have added/updated the documentations.

Further comments