feat(sysctl): Add core module with profiler commands to sysctl

[msbrogli]

Motivation

We currently must use an HTTP API to start and stop a global profiler. Such an API might not be accessible due to networking issues so having the ability to do it through sysctl becomes relevant.

Acceptance Criteria

1. Create commands core.profiler.status, core.profiler.start, and core.profiler.stop in sysctl.
2. Add HathorManagerSysctl which handles all these commands.
3. Add HathorManager.is_profiler_running to keep track whether the profiler is running or not.
4. Add HathorManager.profiler_last_start_time to be able to calculate how long the profiler has been running.

Checklist

• If you are requesting a merge into master, confirm this code is production-ready and can be included in future releases as soon as it gets merged

[codecov]

Codecov Report

Attention: 3 lines in your changes are missing coverage. Please review.

Comparison is base (f4d6a28) 85.34% compared to head (d4e4c8e) 85.35%.

❗ Current head d4e4c8e differs from pull request most recent head 1f68ec7. Consider uploading reports for the commit 1f68ec7 to get more accurate results

Files	Patch %	Lines
hathor/sysctl/core/manager.py	90.47%	1 Missing and 1 partial ⚠️
hathor/builder/sysctl_builder.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #951      +/-   ##
==========================================
+ Coverage   85.34%   85.35%   +0.01%     
==========================================
  Files         291      292       +1     
  Lines       22540    22568      +28     
  Branches     3393     3395       +2     
==========================================
+ Hits        19236    19263      +27     
- Misses       2630     2631       +1     
  Partials      674      674              

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