Add support for CGroups

[stv0g]

Closes #163

[codecov]

Codecov Report

Attention: Patch coverage is 26.12827% with 622 lines in your changes missing coverage. Please review.

Project coverage is 44.03%. Comparing base (8621a66) to head (1f44538).
Report is 29 commits behind head on main.

Files with missing lines	Patch %	Lines
pkg/options/systemd/cgroup.go	2.11%	231 Missing ⚠️
pkg/options/systemd/variants.go	0.00%	72 Missing ⚠️
pkg/teardown.go	9.23%	58 Missing and 1 partial ⚠️
pkg/options/systemd/scope.go	0.00%	44 Missing ⚠️
pkg/cmd.go	55.78%	28 Missing and 14 partials ⚠️
pkg/options/systemd/kill.go	0.00%	35 Missing ⚠️
pkg/base_node.go	32.65%	24 Missing and 9 partials ⚠️
pkg/cgroup.go	51.06%	19 Missing and 4 partials ⚠️
pkg/network.go	48.78%	14 Missing and 7 partials ⚠️
pkg/namespace.go	55.00%	13 Missing and 5 partials ⚠️
... and 9 more

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #221      +/-   ##
==========================================
- Coverage   49.65%   44.03%   -5.63%     
==========================================
  Files          68       76       +8     
  Lines        4084     4653     +569     
==========================================
+ Hits         2028     2049      +21     
- Misses       1825     2343     +518     
- Partials      231      261      +30     

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