[testing-on-gke part 0.1] Add original fio/dlio load-testing code from gcs-fuse-csi-driver

[gargnitingoogle]

Description

This adds relevant files from fio/, dio/ and utils/ directories from https://github.com/GoogleCloudPlatform/gcs-fuse-csi-driver/tree/main/examples for planned fio/dlio testing in gcsfuse on gke.
These contain resources needed to create GKE pods for fio/dlio testing for gcsfuse mounts.

This is a first in a series of PRs. The later PRs will focus on the following

1. Adding an end-2-end script to use the above resources and scripts to run the fio/dlio tests, and according changes in these scripts themselves.
2. Adding parameters in the e2e script to control various configurable properties such as cluster/node configurations, gcsfuse mount options, workload configurations, monitoring/debugging controls etc.

This is followed up in #2284 .

Link to the issue in case of a bug fix.

NA

Testing details

1. Manual - yes, tested manually, am able to use these pod resources and scripts in testing.
2. Unit tests - NA
3. Integration tests - NA

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 72.20%. Comparing base (7005fb0) to head (d1dfaac).
Report is 9 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #2247      +/-   ##
==========================================
+ Coverage   71.47%   72.20%   +0.73%     
==========================================
  Files         106      106              
  Lines       11505    12294     +789     
==========================================
+ Hits         8223     8877     +654     
- Misses       2937     3048     +111     
- Partials      345      369      +24     

Flag	Coverage Δ
unittests	72.20% <ø> (+0.73%)	⬆️

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