Download and Upload Files in Parallel

[aphralG]

Proposed changes

Add max_parallel_file_operations to agent config which specifies the number of file operations which will be done in parallel (Default is 5)
Files will now be uploaded and downloaded in parallel during a config apply and upload config operations.

Example of agent config

client:
    grpc:
       max_parallel_file_operations: 10

Checklist

Before creating a PR, run through this checklist and mark each as complete.

• I have read the CONTRIBUTING document
• I have run make install-tools and have attached any dependency changes to this pull request
• If applicable, I have added tests that prove my fix is effective or that my feature works
• If applicable, I have checked that any relevant tests pass after adding my changes
• If applicable, I have updated any relevant documentation (README.md)
• If applicable, I have tested my cross-platform changes on Ubuntu 22, Redhat 8, SUSE 15 and FreeBSD 13

[codecov]

Codecov Report

❌ Patch coverage is 95.55556% with 2 lines in your changes missing coverage. Please review.
✅ Project coverage is 86.29%. Comparing base (61f1fc8) to head (e1dac3c).

Files with missing lines	Patch %	Lines
internal/file/file_manager_service.go	94.11%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1376   +/-   ##
=======================================
  Coverage   86.29%   86.29%           
=======================================
  Files         102      102           
  Lines       12580    12598   +18     
=======================================
+ Hits        10856    10872   +16     
- Misses       1248     1249    +1     
- Partials      476      477    +1     

Files with missing lines	Coverage Δ
internal/config/config.go	87.19% <100.00%> (+0.07%)	⬆️
internal/config/defaults.go	100.00% <ø> (ø)
internal/config/flags.go	100.00% <ø> (ø)
internal/config/types.go	86.04% <ø> (ø)
internal/file/file_manager_service.go	75.38% <94.11%> (+0.25%)	⬆️

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