Report aria-description always (PR #12500)
# Summary:
The HTML attribute aria-description has been introduced as one aspect of supporting a broader concept of annotations on the web. It maps to accDescription. In contrast to other sources for accDescription such as title, our expectation is annotations should be reported whenever present.
# Description of change:
Experimental support added for reporting aria-description.
Firefox use IA2 attribute 'description' matching accDescription to indicate source is aria-description.
Chrome use IA2 attribute `description-from` with value of 'aria-description' to indicate source, otherwise
fallback to Firefox behavior.
# Other changes:
* Rename UIA._getControlFieldForObject to _getControlFieldForUIAObject
- Since type info in NVDA is not yet ubiquitous, a lot of development relies on
text search / grep.
- This name was easy to confuse with CompoundTextInfo._getControlFieldForObject
* Add typing for virtual buffer / text info / fields normalaziation
- Add return type info for XMLFormatting.XMLTextParser.parse
- Try to confirm if data is an optional string, log a warning if it is None.
* Use constants for Unicode specials
- Symbols referenced regularly in the code, descriptions
from https://en.wikipedia.org/wiki/Specials_(Unicode_block)
-  OBJECT REPLACEMENT CHARACTER, placeholder in the text
for another unspecified object, for example in a compound document.
- � REPLACEMENT CHARACTER, used to replace an unknown, unrecognized,
or unrepresentable character.
* Remove ignoreEditableText param
- As a result of this, controlStack previously had None inserted, now it can be empty.
* Fix names, simplify logic in getTextWithFields
- field -> childObject
- field -> textWithEmbeddedObjectsItem
