Improved grouping of the monitorables in RPC calls

Description

Group the monitorables (registers or others) in meaningful RPC function calls. The grouping proposed follows the concepts described in #172 (closed).

Related Issue

Closes #172 (closed).

How Has This Been Tested?

Tested on the GE1/1 integration setup in b904.

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.