Bug with 'influxdb3 show databases' when outputting to parquet

[sanderson]

The influxdb3 show databases command lists parquet as a supported output format but doesn't provide a -o,--output option to specify a file to write output to. You can't output raw Parquet in a command line.

Steps to reproduce:

1. Create one or more databases in an InfluxDB 3 Core or Enterprise instance.

2. Run the following command to list databases and format the output as Parquet:

   influxdb3 show databases --format parquet

Expected behaviour:

I would expect the show commands, if they are to support Parquet output, would also include a -o, --output option to output the raw Parquet to a file (like the influxdb3 query command does).

Actual behaviour:

When you try to output Parquet on the command line, you get an error similar to:

Show command failed: invalid utf-8 sequence of 1 bytes from index 19