Chore: pass contract feature down from aurora-engine-transactions cra…

…te (#876)

## Description

This PR adds the `contract` feature to the `aurora-engine-transactions`
crate. This allows Near smart contracts using this crate to use the
`ecrecover` host function in the Near runtime to check transaction
signatures instead of relying on an implementation inside the contract.
This is important because the host function uses much less gas and
allows the smart contract to be much smaller.

## Performance / NEAR gas cost considerations

N/A

## Testing

N/A

engine-precompiles/Cargo.toml

@@ -34,7 +34,7 @@ serde_json.workspace = true
 default = ["std"]
 std = ["aurora-engine-types/std", "aurora-engine-sdk/std", "bn/std", "evm/std", "libsecp256k1/std", "ripemd/std", "sha2/std", "sha3/std", "ethabi/std"]
 borsh-compat = ["aurora-engine-types/borsh-compat", "aurora-engine-sdk/borsh-compat"]
-contract = []
+contract = ["aurora-engine-sdk/contract"]
 log = []
 error_refund = []
 ext-connector = []

engine-transactions/Cargo.toml

@@ -24,3 +24,4 @@ hex.workspace = true
 [features]
 std = ["aurora-engine-types/std", "aurora-engine-sdk/std", "aurora-engine-precompiles/std", "evm/std", "rlp/std"]
 impl-serde = ["aurora-engine-types/impl-serde", "serde"]
+contract = ["aurora-engine-sdk/contract", "aurora-engine-precompiles/contract"]