Migrate gnosis/solvers from ethereum-types to alloy

[jmg-duarte]

• Fixes the compilation errors
• Completely replaces the ethereum-types library with alloy
• Makes the ChainId a u64 (the more accurate type); implementing a deserializer and tests
• Replaces the old Address domain type with alloy's Address — like it was done in the backend
• Re-uses eth::Address in more places

[squadgazzz]

LGTM

[MartinquaXD]

Makes the ChainId a u64 (the more accurate type)

It's actually not as clear as one would think. 😅
The chain id is fundamentally a U256 but some time after chain ids were introduced some other EIP limited their range to something that fits inside u64 which led to this confusion.
So for internal logic u64 will work but for stuff like signing and RPC calls the chain id is expected as a U256.