feat: Add and Remove kernels, add with --copy-defaults

[spetrosi]

Enhancement:

1. Add an ability to add and remove kernels. To do that, set state to either present or absent.
2. When adding kernels, you can set copy_defaults: true to copy arguments from the default kernel.
3. Remove the ability to provide lists with kernel keys, now each kernel key can contain a single dict. This makes it consistent with other roles. You can use kernel: ALL to modify all kernels at once.

[spetrosi]

[citest]

[codecov]

Codecov Report

Attention: 33 lines in your changes are missing coverage. Please review.

Comparison is base (433771f) 70.40% compared to head (94b5421) 78.43%.

Files	Patch %	Lines
library/bootloader_settings.py	80.47%	33 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #75      +/-   ##
==========================================
+ Coverage   70.40%   78.43%   +8.03%     
==========================================
  Files           2        2              
  Lines         125      255     +130     
==========================================
+ Hits           88      200     +112     
- Misses         37       55      +18     

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[spetrosi]

[citest]

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[spetrosi]

@richm it's now ready for your review, please take a look.
I do not know how to use mock in unit tests to test Ansible's module method. That's why bootloader_settings.py uses a weird format of running commands, it calls a function to return a cmd to run, or an error to return, and then does the action in the main run_module func. I will try to refactor this, but the role's functionality will stay the same.

[richm]

There are a lot of codeql Variable defined multiple times warnings - would be nice to fix or suppress them.

[spetrosi]

[citest]

[richm]

ready to merge?

[spetrosi]

[citest]

[spetrosi]

[citest]