Support reading table metadata with partition statistics files

[smaheshwar-pltr]

Feature Request / Improvement

apache/iceberg#12450 looks like it'll be merged soon, in which case it's plausible that table metadata will begin to appear with partition statistics fields being set - https://iceberg.apache.org/spec/#partition-statistics.

To note that this is not just a V3 feature but optional for all format versions:

Therefore, I think PyIceberg should support reading of such metadata that can plausibly start popping up. Currently, it doesn't.

[smaheshwar-pltr]

#2146 will close this

[kevinjqliu]

#2146 is merged! We can address actually using these stat files separately :)