fix: do not change hashTreeRoot()

[twoeths]

Motivation

Don't want to modify hashTreeRoot() in any ways

Description

• ListValidatorTreeViewDU: return super.commit() if it's from hashTreeRoot()
• Revert BranchNodeStruct because we compute and apply validator roots in ListValidatorTreeViewDU for batchHashTreeRoot() flow
• Update to the original benchmark to make sure there is no performance regression

 BeaconState ViewDU partially modified tree vc=200000 numModified=100000
    ✓ BeaconState ViewDU batchHashTreeRoot vc=200000                      7.316355 ops/s    136.6801 ms/op        -         85 runs   20.4 s
    ✓ BeaconState ViewDU batchHashTreeRoot - commit step vc=200000        8.522365 ops/s    117.3383 ms/op        -        101 runs   20.3 s
    ✓ BeaconState ViewDU batchHashTreeRoot - hash step vc=200000          38.30311 ops/s    26.10754 ms/op        -         76 runs   20.3 s
    ✓ BeaconState ViewDU hashTreeRoot() vc=200000                         2.260320 ops/s    442.4152 ms/op        -         39 runs   20.7 s
    ✓ BeaconState ViewDU hashTreeRoot - commit step vc=200000             25.73512 ops/s    38.85740 ms/op        -        165 runs   20.2 s
    ✓ BeaconState ViewDU hashTreeRoot - validator tree creation vc=100    7.122690 ops/s    140.3964 ms/op        -         82 runs   20.9 s

this is the same to https://hackmd.io/zj9N5RIqQfCqYz8Y1Xc_hA