Add automatic Pixhawk param checking

[msilvadi]

Adds a standalone Pixhawk parameter validation script that compares live mavlink (I opted for this over trying to use information from test_threading) parameters against the parameter_expectations file. Returns respective exit codes. Passed all linters.

[andy24Dai]

Test script is working! There's some changes that improves the workflow

• only check the parameters in the file (Current way makes it hard to find the parameters that matter)
• Add terminal prints to indicate if code is successfully running since it takes a while to execute