Release DataFusion 48.0.0

[timsaucer]

This Issue is to track the release for DataFusion 48.0.0 now that the upstream repository has been published.

Before release I would like to merge the following PRs:

• feat: python based catalog and schema provider #1156
• feat: add FFI support for user defined functions #1145
• feat: Support Parquet writer options #1123

I think it is important we close these issues

• Merge dataframe documentation prior to release of DF48 #1158
• Add Iceberg documentation to website #1159

Nice to have:

• Attach runtime before calling scan for foreign table provider #1146
• Panic in FFI UDWF when using wrapping lead function #1144