Python API: Add ability to set infotags

[garbear]

Description

Since ListItem.setInfo was deprecated, we moved to managing metadata via infotags.

However, the memory ownership model of infotags makes things brittle, because you're not guaranteed a reference to the underlying listitem's memory. Therefore, setting metadata on infotags isn't guaranteed to update the underlying listitem, breaking our alternative to setInfo in v20.

To work around this, simply add infotag setters.

Motivation and context

Fixes #23042

How has this been tested?

Testing in progress. Will upload test builds.

Types of change

• Bug fix (non-breaking change which fixes an issue)
• Clean up (non-breaking change which removes non-working, unmaintained functionality)
• Improvement (non-breaking change which improves existing functionality)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that will cause existing functionality to change)
• Cosmetic change (non-breaking change that doesn't touch code)
• None of the above (please explain below)

[garbear]

Closing, going to take a different approach