Simplify logic in raxSeek, eliminate it->key reassembly on gt and lt (#9115)
Simplify logic in raxSeek, eliminate it->key reassembly on gt and lt (#9115)

In the original version, the operation of traversing the stack only seems to
reconstruct the key that does not contain the current node.

But in fact We have got the matched length and splitpos in the key in the
raxlowwalk, so I think we can simplify the logic of this part.

Co-authored-by: lizhaolong.lzl <e3ffaddb5e16f353537ddce11bf8f8e9a3b1d3a6@B-54MPMD6R-0221.local>
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