[Feature]: Adding a driver based dynamic variable expression feature

[guptanshuman124]

So, what is it about?

Allow users to define variables whose values update dynamically based on expressions linked to other variables or inputs (drivers). For example, setting y = 2x + a where a can be adjusted via a slider, automatically updating the graph in real time. This enables interactive, formula-driven graphs similar to Desmos.

-> it require some refactoring of classes to implement this in a consistent manner

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[guptanshuman124]

@nsh07 please assign this to me.

it requires dynamic handling of variables inside some class of expression. after the multiplot PR is merged i would start the work on this.

[nsh07]

I will ping you here once I merge that PR. Thanks!