Add FEEL support to timers

[trojanc]

Motivation/Abstract

• Need to support timers values being evaluated from a FEEL expression

Description/Comments

If the timer value starts with = it is assumed to be an expression, and will be evaluated

Checklist

Depending on your PR, please ensure the overall consistency/integrity of the project remains.
Please tick just one check item per section below

Tests

• did you update or create tests for your code changes?
• not relevant

Code examples

• did you update or add example code snippets, which relate to your code changes
• not relevant

Documentation

• did you update or create documentation, which relates to your code changes
• not relevant

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 63.81%. Comparing base (bf154b2) to head (2372cf2).

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #268      +/-   ##
==========================================
+ Coverage   63.44%   63.81%   +0.36%     
==========================================
  Files          28       28              
  Lines        1896     1915      +19     
==========================================
+ Hits         1203     1222      +19     
  Misses        647      647              
  Partials       46       46              

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