Add: changed-packages standalone plugin

[n-thumann]

What

This PR adds changed-packages as a standalone plugin to Troubadix.

Why

To give NASL developers to review large PRs easier and quickly check the changed packages.

References

VTA-397

Checklist

• Tests

[codecov]

Codecov Report

Merging #492 (47694ce) into main (f07cbf5) will decrease coverage by 0.80%.
The diff coverage is 71.98%.

@@            Coverage Diff             @@
##             main     #492      +/-   ##
==========================================
- Coverage   81.49%   80.70%   -0.80%     
==========================================
  Files          71       80       +9     
  Lines        2383     2586     +203     
  Branches      515      550      +35     
==========================================
+ Hits         1942     2087     +145     
- Misses        302      359      +57     
- Partials      139      140       +1     

Impacted Files	Coverage Δ
...alone_plugins/changed_packages/changed_packages.py	31.64% <31.64%> (ø)
...dix/standalone_plugins/changed_packages/package.py	90.90% <90.90%> (ø)
troubadix/standalone_plugins/changed_oid.py	58.00% <100.00%> (-0.83%)	⬇️
...one_plugins/changed_packages/marker/added_epoch.py	100.00% <100.00%> (ø)
...e_plugins/changed_packages/marker/added_release.py	100.00% <100.00%> (ø)
...lone_plugins/changed_packages/marker/added_udeb.py	100.00% <100.00%> (ø)
..._plugins/changed_packages/marker/changed_update.py	100.00% <100.00%> (ø)
...ns/changed_packages/marker/dropped_architecture.py	100.00% <100.00%> (ø)
...andalone_plugins/changed_packages/marker/marker.py	100.00% <100.00%> (ø)
troubadix/standalone_plugins/common.py	100.00% <100.00%> (ø)
... and 1 more

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