cmd: performance test command

[KaloyanTanev]

• Add performance tests for the current machine's hardware:
  • Disk write speed
  • Available memory
  • Total memory
  • Internet latency
  • Internet download speed
  • Internet upload speed
• Change the owner of the charon home folder in Dockerfile to charon user (it used to be root). Previously charon user was unable to create any files in its home dir.
• Change test command unit tests not to assert the verdict of metrics that are based on a measurement (i.e.: don't assert good disk write time).

category: feature ticket: #3207

[codecov[bot]]

Codecov Report

Attention: Patch coverage is 53.28185% with 242 lines in your changes missing coverage. Please review.

Project coverage is 58.05%. Comparing base (4249725) to head (be20c0b). Report is 5 commits behind head on main.

Files	Patch %	Lines
cmd/testperformance.go	50.21%	199 Missing and 36 partials :warning:
cmd/ascii.go	84.61%	6 Missing :warning:
cmd/cmd.go	0.00%	1 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #3197 +/- ## ========================================== - Coverage 58.22% 58.05% -0.17% ========================================== Files 210 211 +1 Lines 29699 30253 +554 ========================================== + Hits 17291 17563 +272 - Misses 10550 10795 +245 - Partials 1858 1895 +37 ```

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[sonarcloud[bot]]

Quality Gate passed

Issues
2 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
8.1% Duplication on New Code

See analysis details on SonarCloud