Provide data statistics report as part of CytoTable output

In talking about useful features with @jenna-tomkinson and @MikeLippincott it came up that it'd be useful to see summary statistics of some kind as part of CytoTable output. For example, showing how many compartment objects are found from source to target, number of rows with NA, and other areas. This might be something we could include in Parquet metadata or other related output from CytoTable.

Start by tracing how CytoTable produces its output and where Parquet metadata or related output is assembled. Clarify which summary statistics are required, including compartment counts and NA-row counts, and decide where the report should appear. Done means the statistics, output location, and expected behavior are defined and implemented with verification for representative CytoTable data.

Written by the indexing model from the issue text.