Semantic highlighting: Highlight some top level variables as constants

[yangdanny97]

Describe the Bug

Right now they are highlighted the same as other variables, but perhaps we should highlight the variables different if they only contain capital letters, numbers, and underscore.

If we want to get REALLY fancy, maybe we could also check that

1. they defined in an assignment where the RHS is a literal (or the variable has a literal type)
2. they are never re-assigned

I think maybe just implementing the basic condition is good enough.

Sandbox Link

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(Only applicable for extension issues) IDE Information

No response

[AryanBagade]

@yangdanny97 could you please assign me this issue

[AryanBagade]

Will try to implement fancy one as well!!!!

[yangdanny97]

I'm not sure the fancy stuff is necessary, was just brainstorming. Can you verify if Pylance does anything fancy with the highlighting logic, or if it's just based on the capitalization of the name?

[AryanBagade]

On it !!