Add EVM amount rounding utils and fix sink max precision leak

[liobrasil]

Summary

• Add EVMAmountUtils for explicit rounding direction and use it in ERC4626 and Uniswap V2/V3 swap quotes.
• Align Uniswap V3 max-in price impact math for token0 and clarify 600 bps comment.
• Enforce sink max using ceil-rounded EVM balances to avoid precision leaks.

Issues solved

Commit 1: Add EVM amount rounding helpers and use in swap quotes

• Problem: ERC20 amounts with >8 decimals were converted inconsistently to UFix64, so quotes could overstate outputs or understate required inputs.
• Fix: Centralize rounding rules in EVMAmountUtils (floor for outputs, ceil for inputs) and update swap connectors; move rounding tests to a dedicated file and add the contract to flow.json and test deployments.
• Result: Quotes are conservative and consistent across connectors.

Commit 2: Ceil EVM balances when enforcing sink max

• Problem: minimumCapacity rounded EVM balances down, leaving phantom capacity when balances were not UFix64-quantized; deposits could exceed sinkMax after conversion.
• Fix: Round balances up when computing capacity; add a regression test for non-quantum EVM balances; include EVMAmountUtils in connector config groups.
• Result: Sink max enforcement is reliable even with non-quantized balances.

Testing

• make test (flow test --cover --covercode="contracts" --coverprofile="coverage.lcov" ./cadence/tests/*_test.cdc)