feat(core): add batch registration to Almanac API and Almanac Contract

[jrriehl]

Proposed Changes

When running the Bureau, the Bureau will now use the Almanac API's batch registration endpoint by default to register all agents in a single request. Additionally, if a wallet is provided in the Bureau's init args, it will also send the Almanac contract registration transactions in a batch. By default, with no wallet address provided, the agents will register themselves as before, so this update should be fully backwards compatible.

Linked Issues

[if applicable, add links to issues resolved by this PR]

Types of changes

What type of change does this pull request make (put an x in the boxes that apply)?

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

Checklist

Put an x in the boxes that apply:

• [ ] I have read the CONTRIBUTING guide
• [x] Checks and tests pass locally

If applicable

• [ ] I have added tests that prove my fix is effective or that my feature works
• [ ] I have added/updated the documentation (executed the script in python/scripts/generate_api_docs.py)

[jrriehl]

All changes included in https://github.com/fetchai/uAgents/pull/551.