✅ Add utilities for integration testing & add a test for Mempool asynchronicity

[wraitii]

No description provided.

[codecov]

Codecov Report

Attention: Patch coverage is 91.72932% with 22 lines in your changes missing coverage. Please review.

✅ All tests successful. No failed tests found.

Files with missing lines	Patch %	Lines
src/utils/integration_test.rs	93.08%	11 Missing ⚠️
src/mempool/test/async_data_proposals.rs	92.70%	7 Missing ⚠️
src/consensus.rs	0.00%	1 Missing ⚠️
src/data_availability.rs	0.00%	1 Missing ⚠️
src/mempool.rs	0.00%	1 Missing ⚠️
src/single_node_consensus.rs	0.00%	1 Missing ⚠️

Files with missing lines	Coverage Δ
src/data_availability/node_state/verifiers.rs	11.11% <100.00%> (+3.23%)	⬆️
src/genesis.rs	91.92% <100.00%> (ø)
src/consensus.rs	83.44% <0.00%> (ø)
src/data_availability.rs	79.21% <0.00%> (+11.31%)	⬆️
src/mempool.rs	80.90% <0.00%> (+12.83%)	⬆️
src/single_node_consensus.rs	79.73% <0.00%> (+28.75%)	⬆️
src/mempool/test/async_data_proposals.rs	92.70% <92.70%> (ø)
src/utils/integration_test.rs	93.08% <93.08%> (ø)

... and 8 files with indirect coverage changes