Convert any number knobs especially in timeline widget to accept basic math

[mvineeta]

Similar to tools like Nuke, this feature would allow users to enter simple math expressions directly into any number input field, particularly in the timeline widget, for faster and more intuitive frame calculations.

🎯 Feature Request:

Enable number knobs (especially timeline frame fields) to parse and evaluate basic math expressions like:

+28
-15
*2
/2
1012 + 28

For example:

• If the current frame is 1012 and the user types +28 or 1012 + 28, the field should evaluate to 1040 when they hit Enter.
• Should support combinations like 1000 + 8 * 2.

✅ Expected Behavior:

1. All number fields, especially those in the timeline widget, should evaluate input expressions on commit.
2. Valid inputs

• Full expressions like 1000 + 32
• Relative entries like +8, -5, *2, /3

3. The field displays the resulting numeric value after evaluation.
   Invalid expressions should be safely rejected or ignored with feedback.

💡 Why It’s Useful:

• Saves time for artists, reviewers, and technical users.
• Matches expectations from other tools (like Nuke, After Effects).
• Improves workflow, especially when jumping frames or tweaking values.