Added trivial implementation of MockEthProvider for completeness.

[PlamenHristov]

Completed trivial implementation of MockEthProvider, given the data model defined, so that it can be used in integration tests.

It's not ideal, but is a good start for whoever wants to expand the data model to accomodate historical blocks

[codecov]

Codecov Report

Merging #4960 (40619ad) into main (ee5b8c9) will decrease coverage by 22.63%.
The diff coverage is 0.00%.

Files	Coverage Δ
crates/storage/provider/src/test_utils/mock.rs	15.81% <0.00%> (-6.46%)	⬇️

... and 333 files with indirect coverage changes

Flag	Coverage Δ
integration-tests	?
unit-tests	44.54% <0.00%> (-18.01%)	⬇️

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

Components	Coverage Δ
reth binary	17.53% <ø> (-13.23%)	⬇️
blockchain tree	39.57% <ø> (-41.06%)	⬇️
pipeline	63.17% <ø> (-25.28%)	⬇️
storage (db)	51.06% <0.00%> (-23.35%)	⬇️
trie	62.49% <ø> (-32.03%)	⬇️
txpool	35.46% <ø> (-13.06%)	⬇️
networking	55.20% <ø> (-20.93%)	⬇️
rpc	23.50% <ø> (-34.56%)	⬇️
consensus	50.57% <ø> (-12.45%)	⬇️
revm	21.23% <ø> (-6.57%)	⬇️
payload builder	3.39% <ø> (-4.57%)	⬇️
primitives	62.68% <ø> (-22.76%)	⬇️

[mattsse]

oh that's actually quite clever.

this will prevent panics and instead results in None responses if the state functions were to be called

lgtm