Remove root option and add dates as include_from file

[tralsos]

Solves #736 and #728

• Removing the option to specify root for relative paths
• Adding option to specify dates in yaml config by including it from a another global config yaml file.

The include_from option is using the FMUYamlSafeLoader in grid3d_maps

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 85.97%. Comparing base (0bd547c) to head (345a617).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #738      +/-   ##
==========================================
- Coverage   85.99%   85.97%   -0.03%     
==========================================
  Files          51       51              
  Lines        6854     6837      -17     
==========================================
- Hits         5894     5878      -16     
+ Misses        960      959       -1     

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