Move tree key computation to verkle and simplify

[acolytec3]

This migrates the getTreeKey* methods (and related constants) from statemanager to verkle where they are more properly housed.

• Replaces getTreeKeyFor* methods with a single getTreeKey that accepts a leafType as a second input and returns the correct tree key corresponding to the value type

[codecov]

Codecov Report

Attention: Patch coverage is 64.28571% with 20 lines in your changes are missing coverage. Please review.

Project coverage is 83.12%. Comparing base (d24ca11) to head (2a2c698).
Report is 10 commits behind head on master.

Additional details and impacted files

Flag	Coverage Δ
block	80.78% <ø> (?)
blockchain	90.97% <ø> (ø)
common	94.29% <ø> (+<0.01%)	⬆️
devp2p	81.85% <ø> (?)
evm	73.76% <100.00%> (?)
genesis	99.98% <ø> (?)
statemanager	74.56% <58.33%> (+0.25%)	⬆️
trie	59.69% <ø> (?)
util	81.43% <ø> (ø)

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