chore(node/rpc): Refactor p2p rpc

[theochap]

Description

Refactoring PR that tidies up the RPC implementation of kona-p2p in preparation of the implementation of the node rpc api.

Please note that I had to slightly change the feature-gating of the Metrics struct in the p2p crate to allow access to the Metrics struct inside net without having to feature-gate it's usage every time

Progress towards #1634

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 34 lines in your changes missing coverage. Please review.

Project coverage is 59.8%. Comparing base (1cb1ce2) to head (44cbfc6).
Report is 4 commits behind head on main.

Files with missing lines	Patch %	Lines
crates/node/p2p/src/rpc/types.rs	0.0%	29 Missing ⚠️
crates/node/p2p/src/rpc/request.rs	0.0%	4 Missing ⚠️
crates/node/p2p/src/net/builder.rs	0.0%	1 Missing ⚠️

❗ There is a different number of reports uploaded between BASE (1cb1ce2) and HEAD (44cbfc6). Click for more details.

HEAD has 6 uploads less than BASE

Flag	BASE (1cb1ce2)	HEAD (44cbfc6)
	10	4

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[refcell]

Would like to see these types split into separate modules in the future instead of having a large 376 line file. Not a blocker for this PR since I know it was ported over. Bad practice set by me 😅

[refcell]

I'm happy with this