Add unpacker for the v301b and v302a data formats

Description

This MR adds an unpacker supporting the v301b (CMS prior to August 2022 & GEM 2021 TB) and v302a (CMS since August & GEM spring 2022 TB) data formats. Additionally, a RAW-to-test tool is provided as proof of functionality. It can used for debugging, both of the unpacker or the data format.

Related Issue

Fixes #200 (closed).

How Has This Been Tested?

Can decode to text the following raw files:

• GEM 2021 TB (v301b)
• CMS Oct latency scan (v302a)

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• My code follows the code style of this project.
• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I have read the CONTRIBUTING document.
• I have added tests to cover my changes.
• All new and existing tests passed.