add number of diurnal sample and power level to the yaml

[uramirez8707]

Description
Saves the number of diurnal samples and the pow level to the diag_yaml
Adds corresponding get_* and has_* functions

This is to avoid having to get them from the %reduction string variable, every time they are needed.

How Has This Been Tested?
CI

Checklist:

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• Any dependent changes have been merged and published in downstream modules
• New check tests, if applicable, are included
• make distcheck passes