Convert Remaining Messages to JSON

[Ethan-DeBandi99]

Once #1587 is completed, the remaining messages will need to be reformatted to send arguments as JSON.

Some messages are being updated with the initial work. Once those are done, this issue should be updated with a list of messages to update.

Files in src to Modify

Only tracking src because multiple Python functions may require modification per src file

• [x] ArgSortMsg.chpl
• [x] BroadcastMsg.chpl
• [x] CastMsg.chpl
• [x] ConcatenateMsg.chpl
• [x] DataFrameIndexingMsg.chpl
• [x] EfuncMsg.chpl
• [x] FindSegmentsMsg.chpl
• [x] FlattenMsg.chpl
• [x] HDF5Msg.chpl
• [x] In1dMsg.chpl
• [ ] IndexingMsg.chpl
• [ ] JoinEqWithDTMsg.chpl
• [ ] KEtremeMsg.chpl
• [ ] MetricsMsg.chpl
• [ ] OperatorMsg.chpl
• [x] ParquetMsg.chpl
• [ ] RandMsg.chpl
• [ ] ReductionMsg.chpl
• [ ] RegistrationMsg.chpl
• [ ] SegmentedMsg.chpl
• [ ] SequenceMsg.chpl
• [ ] SortMsg.chpl
• [x] StatsMsg.chpl
• [x] UniqueMsg.chpl