feat(rpc): add rpc_ namespace

[TechieBoy]

Closes #2923

[mattsse]

nice,

a few suggestions

[codecov-commenter]

Codecov Report

Merging #2928 (9ffb4c6) into main (6353792) will decrease coverage by 0.08%.
The diff coverage is 56.81%.

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@@            Coverage Diff             @@
##             main    #2928      +/-   ##
==========================================
- Coverage   71.09%   71.01%   -0.08%     
==========================================
  Files         517      520       +3     
  Lines       67083    67117      +34     
==========================================
- Hits        47692    47664      -28     
- Misses      19391    19453      +62     

Flag	Coverage Δ
integration-tests	17.29% <13.63%> (-0.03%)	⬇️
unit-tests	65.91% <43.18%> (-0.07%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
crates/rpc/rpc-api/src/lib.rs	100.00% <ø> (ø)
crates/rpc/rpc-api/src/rpc.rs	0.00% <0.00%> (ø)
crates/rpc/rpc-types/src/lib.rs	100.00% <ø> (ø)
crates/rpc/rpc/src/lib.rs	100.00% <ø> (ø)
crates/rpc/rpc/src/rpc.rs	0.00% <0.00%> (ø)
crates/rpc/rpc-builder/src/lib.rs	68.45% <46.66%> (-0.37%)	⬇️
crates/rpc/rpc-types/src/rpc.rs	85.71% <85.71%> (ø)

... and 17 files with indirect coverage changes

[mattsse]

awesome tysm for this!

I only changed the naming and made the return type not an Arc