fix: add validation for minimum balance to be aggregated

[kerber0x]

Description and Motivation

This adds a minimum balance to be aggregated by the contracts. Skips small balances to prevent errors when aggregating assets and sending them back from the fee collector to the fee distributor.

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.