Update verkle statemanager API to match interface

[acolytec3]

While working on #4021, I discovered that the stateManagerInterface has an optional method verifyVerklePostState that is called verifyPostState on the two verkle state manager implementations.

This cleans up that discrepancy

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 79.54%. Comparing base (846fea7) to head (daefdfb).
Report is 1 commits behind head on master.

Additional details and impacted files

Flag	Coverage Δ
block	84.33% <ø> (ø)
blockchain	89.32% <ø> (ø)
client	67.99% <ø> (ø)
common	97.51% <ø> (ø)
devp2p	86.78% <ø> (ø)
evm	73.02% <ø> (ø)
mpt	89.69% <ø> (-0.06%)	⬇️
statemanager	69.06% <100.00%> (ø)
static	99.11% <ø> (ø)
tx	90.59% <ø> (ø)
util	89.36% <ø> (ø)
vm	55.50% <ø> (ø)

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