Changed baseclass of rms model classes to DictModel

[RajaPiseD]

Description

Added DictModel class Changed baseclass of rms model classes to DictModel to allows class properties to be accessed similar to dictionay Update datamodel-codegen instruction

Checklist

• [X] I have tested these changes locally.
• [X] I have added unit tests (if appropriate).
• [X] I have added necessary documentation or updated existing documentation.
• [X] I have linked the issue(s) addressed by this PR if any.

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 93.46%. Comparing base (85d92b2) to head (f40c886).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #379 +/- ## ========================================== + Coverage 93.43% 93.46% +0.02% ========================================== Files 61 62 +1 Lines 2269 2279 +10 ========================================== + Hits 2120 2130 +10 Misses 149 149 ```

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