add optimism cli crate

[mattsse]

Add crates/optimism/cli crate

this is where we'll define the top level optimism cli arg (reused from cli/commands)
and add the op specific commands, like:

reth/bin/reth/src/cli/mod.rs

Lines 195 to 202 in 6e146e1

	/// This syncs RLP encoded OP blocks below Bedrock from a file, without executing.
	#[cfg(feature = "optimism")]
	#[command(name = "import-op")]
	ImportOp(crate::commands::import_op::ImportOpCommand),
	/// This imports RLP encoded receipts from a file.
	#[cfg(feature = "optimism")]
	#[command(name = "import-receipts-op")]
	ImportReceiptsOp(crate::commands::import_receipts_op::ImportReceiptsOpCommand),

TODO

• first PR: add blank crate