Prepare Tkinter 9.1 screenreader support

Feature or enhancement

Proposal:

Tcl/Tk adds support for screen-readers in Tk 9.1:
https://www.tcl-lang.org/software/tcltk/9.1.html

The related TIP 733 can be found here:
https://core.tcl-lang.org/tips/doc/trunk/tip/733.md

The C-Api documentation is provided at least here:
https://github.com/tcltk/tk/blob/main/doc/accessible.n

And the actual implementation is here:
https://github.com/tcltk/tk/blob/main/generic/tkAccessibility.c

Even though default values for standard widgets will be present custom widgets drawn by a Canvas can't be foreseen and a user might wish to alternate the defaults.
https://core.tcl-lang.org/tk/tktview/1110144ae9

Since tkinter is a thin wrapper around tk the appropriated API should be something like this:

def accessible(window, **kwargs):
    sub = [
        'role', 'name', 'description', 'value',
        'state', 'action', 'help string'
        ]
    parse = ()
    for cmd in sub:
        if val:= kwargs.pop(cmd, None):
            parse = parse + (cmd, val)
    if kwargs:
        raise ValueError
    window._tk.call('accessible', str(window), *parse)

Might best be placed into Misc.

Has this already been discussed elsewhere?

No response given

Links to previous discussion of this feature:

No response

Linked PRs

• gh-153246
• gh-153247

Tk 9.1 のインターフェースを理解するために、TIP 733、Tk の accessible.n C-API ドキュメント、および generic/tkAccessibility.c を読んでください。提案された方向性を、リンクされている PR gh-153246 および gh-153247 と比較し、その後、Tkinter API の適切な配置場所（おそらく Misc）を確認してください。カスタム Canvas ウィジェットがアクセシビリティ値を提供または上書きできれば完了です。