[views-ax] Introducing setter and remove method for kValue attribute

Add a setter and a remove method in ViewAccessibility in order to
be able to update the cache whenever the attribute kValue changes,
and to remove the kValue attribute when ProgressBar indicator
is indeterminate.

ProgressBar indicator is used to display the current progress,
and indicator (crrent_value_) value should be in range
[0.0, 1.0].

This CL is part of the ViewsAX project:
https://docs.google.com/document/d/1Ku7HOyDsiZem1yaV6ccZ-tz3lO2XR2NEcm8HjR6d-VY/edit#heading=h.ke1u3utej413

Bug: 325137417
Change-Id: I7bcb71e5b5c8337c16a83995e8a2fdabd752ead6
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5646761
Reviewed-by: Javier Contreras <javiercon@microsoft.com>
Commit-Queue: Javier Contreras <javiercon@microsoft.com>
Reviewed-by: Jacques Newman <janewman@microsoft.com>
Cr-Commit-Position: refs/heads/main@{#1322254}