feat: add scaffold impl of EthFilter API handler

[leruaa]

Closes #1247

Th previous PR for this issue hasn't been merged, I think I deleted the branch too fast on my side.... Sorry about that.

[mattsse]

oops :)

ty for reopening

[codecov-commenter]

Codecov Report

Merging #1270 (bd33611) into main (a58cf8a) will decrease coverage by 0.06%.
The diff coverage is 0.00%.

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@@            Coverage Diff             @@
##             main    #1270      +/-   ##
==========================================
- Coverage   76.42%   76.36%   -0.06%     
==========================================
  Files         342      343       +1     
  Lines       38385    38412      +27     
==========================================
- Hits        29334    29333       -1     
- Misses       9051     9079      +28     

Flag	Coverage Δ
unit-tests	76.36% <0.00%> (-0.06%)	⬇️

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

Impacted Files	Coverage Δ
crates/rpc/rpc/src/eth/filter.rs	0.00% <0.00%> (ø)
crates/rpc/rpc/src/eth/pubsub.rs	0.00% <ø> (ø)
crates/rpc/rpc/src/lib.rs	100.00% <ø> (ø)
crates/net/network/src/peers/manager.rs	82.44% <0.00%> (-0.09%)	⬇️
crates/net/discv4/src/lib.rs	66.41% <0.00%> (-0.08%)	⬇️
crates/net/eth-wire/src/capability.rs	61.32% <0.00%> (+0.94%)	⬆️

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