added support for autocompletion on the low ui approach for pycharm

[FabienArcellier]

Pycharm does not currently support autocompletion on TypedDict passed as an argument to a method. This problem does not seem to be really addressed in their roadmap.

• https://youtrack.jetbrains.com/issue/PY-54151/TypedDict-completion-at-callee-does-not-work-for-methods

On the other hand, Pycharm supports autocompletion on static methods of a class.

I propose a draft to manage the component tree as a context variable. This pattern offer 2 advantages :

• all the methods of ui manager can be static
• a developper than build an extension can manipulate the component tree easily inside its extension