SDSTOR-12187 : PartitionUtilization Endpoint

[shosseinimotlagh]

Expose PartitionUtilization as volume used size divided by AM total size

Testing:

in one terminal, run
bin/test_volume --gtest_filter=VolTest.init_io_test --remove_file_on_shutdown=1 --delete_volume=1 --run_time=10000 --http_port=5000 --max_volume=1 --p_volume_size=100 --max_disk_capacity=1

in another terminal, run the below command to get the volume uuid:
nublox-tools/AM/hs_http_cli_tool.py get_object --name test_files/vol0

run the below API command:
curl http://localhost:5000/api/v1/utilization/[volumeUUID]

[codecov-commenter]

Codecov Report

Attention: 16 lines in your changes are missing coverage. Please review.

Comparison is base (6dc0544) 45.07% compared to head (821f897) 45.31%.

Files	Patch %	Lines
src/homeblks/homeblks_http_server.cpp	12.50%	14 Missing ⚠️
src/homeblks/home_blks.cpp	0.00%	2 Missing ⚠️

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Additional details and impacted files

@@               Coverage Diff               @@
##           stable/v3.x     #271      +/-   ##
===============================================
+ Coverage        45.07%   45.31%   +0.23%     
===============================================
  Files              134      126       -8     
  Lines            17197    16376     -821     
  Branches          2059     1944     -115     
===============================================
- Hits              7752     7421     -331     
+ Misses            8724     8254     -470     
+ Partials           721      701      -20     

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[raakella1]

LG!