Add docstrings

[macpijan]

Code should be better documented.

We can split the effort into documenting following modules:

• CLI
• libs/rte*
• libs/snipeit_api
• libs/sonoff_api
• libs/utils
• libs/zabbix
• rf/*

Some documentation has been added here: https://github.com/Dasharo/osfv-scripts/pull/78/files
There is no specific format requirement set in stone yet. We can propose one here.

Hint: once we define a format, LLM can be a huge help to generate the docstrings based on code.

[JakubRed]

Regarding the question in JIRZe:

If this standard is ok, then I will apply it to all the methods.

Untill now, I tried to create manually. Searching for smaller parts of the code. (I'm not sure what is the company policy on using LLM and such). If it is allowed then it would considerably speed up execution of the task.

[JakubRed]

PR#109 I added some inline documentation in the files listed above.
I mostly focused on short summaries.
There is still a lot to be added but due to the sheer number of methods that is all I was able to do in given time frame.