Leverage `partitionValues_parsed` from arrow state to report partition values

[roeap]

Description

Currently we parse partition values ad-hoc from raw string data in teh various state / snapshot APIs. Since we now have partitionValues_parsed included in the arrow state, we should directly read from that data to avoid additional work.

Use Case

Related Issue(s)

[omkar-foss]

Please ignore the issue mention above, it was a typo while trying something out. Sorry!

[ion-elgreco]

@roeap are you still looking into this?

[roeap]

@ion-elgreco - sort of, the main avenue to a more optimized treatment would now IMO be via kernel. Hoping to file a larger issue soon to align on the best approach for adoption.

[ion-elgreco]

@roeap alright, looking forward to that :)

[roeap]

this has been addressed in #3801 (and likely also before). Closing it for now.