use full qualified reth_codecs:: path + syntax when deriving reth_codecs::Compact

[mattsse]

Describe the feature

currently we expect that Compact trait is in scope:

reth/crates/storage/codecs/derive/src/compact/generator.rs

Lines 34 to 36 in bc43613

	quote! {
	impl Compact for #ident
	}

hence we have a bunch of these:

reth/crates/primitives/src/receipt.rs

Lines 13 to 14 in bc43613

	#[cfg(feature = "reth-codec")]
	use reth_codecs::{Compact, CompactZstd};

we can get rid of this by using the fully qualified path and syntax in the code we generate.

we also need a new attribute so that we can use this in the reth_codes crate itself, e.g.:

reth/crates/storage/codecs/src/alloy/transaction/legacy.rs

Lines 6 to 9 in bc43613

	#[derive(Debug, Clone, PartialEq, Eq, Default, Compact)]
	#[cfg_attr(test, derive(arbitrary::Arbitrary, serde::Serialize, serde::Deserialize))]
	#[cfg_attr(test, crate::add_arbitrary_tests(compact))]
	pub(crate) struct TxLegacy {

this should be similar to serde crate attribute

https://serde.rs/container-attrs.html#crate

so that we can use in the quote!

let reth_codecs = reth_codecs_path(); // TODO needs to check for `crate` attribute
quote!{
 impl #reth_codes::Compact ...

}

This task is done if we can remove all feature gated use reth_codecs::Compact imports

#11863 has some wip and can be taken over

Additional context

No response

[aroralanuk]

Can I take this one?