Add system command to show

[pauldix]

We expose all information about the server and its state through system tables. The user can execute queries from the command line to get at this, but it would be a nice convenience to have a command to quickly show the most recent records in any system table.

Something like:

influxdb3 show system parquet_files --limit=10

Limit should default to 100 so it is optional. The help should display what are valid names for the system table we're querying. Under the covers the CLI should just execute the query for the user.

This would likely be good enough to close out #25792