perf(QTree): QTree opt-in property to enable virtual scrolling (fix #17941)

[gilmar-sales]

What kind of change does this PR introduce?

• Bugfix
• Feature
• Documentation
• Code style update
• Refactor
• Build-related changes
• Other, please describe:

Does this PR introduce a breaking change?

• Yes
• No

The PR fulfills these requirements:

• It's submitted to the dev branch (or v[X] branch)
• When resolving a specific issue, it's referenced in the PR's title (e.g. fix: #xxx[,#xxx], where "xxx" is the issue number)
• It's been tested on a Cordova (iOS, Android) app
• It's been tested on an Electron app
• Any necessary documentation has been added or updated in the docs or explained in the PR's description.

Other information:

• This PR will solve the bad performance to find the expanded/ticked node when the big tree is loaded, and solves the rendering overhead when full expanded.

[gilmar-sales]

I'll finish this PR by refactoring the meta computed that is spending so much time with large data sets, I'm thinking in remove the computed up-bottom strategy and do bottom-up travel from the edited node to recompute only the necessary metas, instead of recomputing the entire meta every time a node gets expanded/ticked.

[gilmar-sales]

After deeper investigations, I noticed that the browser is struggling to render all tree nodes, so I tried to add support for virtual scrolling, it's pretty responsive, but I need to figure out how to control different heights for each node...

[gilmar-sales]

Gravar a tela_20260110_013710.webm
Almost there, I'll check if it would still be compatible with the transition.