Refactoring to unify evm Address and U256 types, serializing with serde

[LukaszRozmej]

Description

Refactor to simplify conversions
Serialize with serde

[codecov]

Codecov Report

Merging #825 (bbd22ae) into nightly (44db227) will increase coverage by 0.1%.
The diff coverage is 98.3%.

Files Changed	Coverage Δ
...stem/module-implementations/sov-evm/src/genesis.rs	98.7% <75.0%> (ø)
full-node/sov-ethereum/src/lib.rs	92.7% <100.0%> (-0.2%)	⬇️
...-system/module-implementations/sov-evm/src/call.rs	95.0% <100.0%> (ø)
...ule-implementations/sov-evm/src/evm/conversions.rs	67.9% <100.0%> (+0.7%)	⬆️
...ystem/module-implementations/sov-evm/src/evm/db.rs	80.0% <100.0%> (ø)
...odule-implementations/sov-evm/src/evm/db_commit.rs	95.8% <100.0%> (-0.2%)	⬇️
.../module-implementations/sov-evm/src/evm/db_init.rs	100.0% <100.0%> (ø)
...stem/module-implementations/sov-evm/src/evm/mod.rs	100.0% <100.0%> (ø)
...em/module-implementations/sov-evm/src/evm/tests.rs	97.8% <100.0%> (ø)
...ule-implementations/sov-evm/src/evm/transaction.rs	81.8% <100.0%> (ø)
... and 2 more

... and 5 files with indirect coverage changes

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