feat: contracts and engine logic for Flip delegation

[albert-llimos]

Pull Request

Closes: PRO-2357

Checklist

Please conduct a thorough self-review before opening the PR.

• I am confident that the code works.
• I have written sufficient tests.
• I have written and tested required migrations.
• I have updated documentation where appropriate.

Summary

New smart contract can be found here: chainflip-io/chainflip-eth-contracts#510

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✨ Finishing Touches

🧪 Generate unit tests

• Create PR with unit tests
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• Commit unit tests in branch feat/sc-utils-flip-delegate

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[codecov]

Codecov Report

❌ Patch coverage is 40.65657% with 235 lines in your changes missing coverage. Please review.

Files with missing lines	Patch %	Lines
engine/src/witness/eth/sc_utils.rs	8%	122 Missing ⚠️
...e-chain/runtime/src/chainflip/ethereum_sc_calls.rs	0%	30 Missing and 2 partials ⚠️
state-chain/pallets/cf-funding/src/lib.rs	67%	26 Missing and 3 partials ⚠️
engine/src/witness/eth.rs	0%	22 Missing ⚠️
...ronment/src/migrations/eth_sc_utils_environment.rs	0%	13 Missing ⚠️
state-chain/pallets/cf-funding/src/weights.rs	0%	6 Missing ⚠️
state-chain/node/src/chain_spec.rs	33%	4 Missing ⚠️
state-chain/pallets/cf-funding/src/mock.rs	64%	3 Missing and 1 partial ⚠️
state-chain/chains/src/evm.rs	0%	3 Missing ⚠️

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