chore: restore `foundry_fork_db`, `reth_db_layer` and `reth_db_provider` examples

[zerosnacks]

Follow up of #199

Blockers

Reth uses revm = { version = "22.0.1", default-features = false }
Foundry Fork DB uses revm = { version = "23.0.0", features = ["std", "serde"] }

Pending

• Bump foundry-fork-db after REVM compatibility (feat: bump revm to 21.0.0 and alloy to 0.13.0 foundry-rs/foundry-fork-db#44)
• Update examples to be compatible with new REVM