feat(rdb): add benchmarks for instance get, backup get/list, and database list

[jremy42]

close 4429

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Relates OR Closes #0000

Release note for CHANGELOG:

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 57.45%. Comparing base (0c63f5e) to head (63c5bc5).
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #5125   +/-   ##
=======================================
  Coverage   57.45%   57.45%           
=======================================
  Files         308      308           
  Lines       67280    67280           
=======================================
  Hits        38657    38657           
  Misses      27182    27182           
  Partials     1441     1441           

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