chore: add minimum collectable and aggregable balances

[kerber0x]

Description and Motivation

This ensures there won't be any possible errors when creating epochs, which could in some edge cases occur.

Related Issues

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Checklist:

• [x] I have read Migaloo's contribution guidelines.
• [x] My pull request has a sound title and description (not something vague like Update index.md)
• [x] All existing and new tests are passing.
• [x] I updated/added relevant documentation.
• [x] The code is formatted properly cargo fmt --all --.
• [x] Clippy doesn't report any issues cargo clippy -- -D warnings.
• [x] I have regenerated the schemas if needed cargo schema.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 94.46%. Comparing base (43601d4) to head (a18a52a).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #289 +/- ## ========================================== - Coverage 94.46% 94.46% -0.01% ========================================== Files 219 219 Lines 24858 24860 +2 ========================================== + Hits 23482 23483 +1 - Misses 1376 1377 +1 ```

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