Fix Log serde for non self describing protocols

[kpp]

Log flattens data for serde, which is an issue for a non self describing protocols as bcs and bincode. Without this fix test will fail with:

1. bcs:

---- log::tests::test_bcs_encode_decode stdout ----
thread 'log::tests::test_bcs_encode_decode' panicked at crates/primitives/src/log.rs:248:51:
called `Result::unwrap()` on an `Err` value: NotSupported("deserialize_any")

2. bincode:

---- log::tests::test_bincode_encode_decode stdout ----
thread 'log::tests::test_bincode_encode_decode' panicked at crates/primitives/src/log.rs:227:52:
called `Result::unwrap()` on an `Err` value: SequenceMustHaveLength

Code affected: reth_primitives::Receipt.