add txn_put_get benchmark for #18667

[hwdef]

Ref: #18667 #20545

This PR adds a benchmark for txn_put_get, specifically tailored for issue #18667.

Regarding the original issue, there are some existing solutions. However, we are concerned that they might impact performance. The challenge is that we currently lack a dedicated benchmark case to quantify the extent of this potential impact. Some discussions in #20545

The key to this benchmark case is to perform both the PUT and GET within a single transaction while utilizing a prefix query. This way, when there is ahrtr@76ac23f, the GET/RANGE requests can not be skipped, which degraded performance, and vice versa.

I'll attach the benchmark results shortly.

cc @siyuanfoundation @serathius @ahrtr

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 69.30%. Comparing base (bc12c94) to head (1833b61).
⚠️ Report is 4 commits behind head on main.

Additional details and impacted files

see 23 files with indirect coverage changes

@@            Coverage Diff             @@
##             main   #20953      +/-   ##
==========================================
+ Coverage   69.20%   69.30%   +0.10%     
==========================================
  Files         422      422              
  Lines       34841    34841              
==========================================
+ Hits        24110    24148      +38     
+ Misses       9330     9300      -30     
+ Partials     1401     1393       -8     

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[hwdef]

/retest

[hwdef]

/test pull-etcd-unit-test-arm64