Improved CLI: explicit CLI flags for compaction settings

[teh-cmc]

Before:

$ RERUN_CHUNK_MAX_ROWS=4096 RERUN_CHUNK_MAX_BYTES=1048576 rerun rrd compact /my/recordings/*.rrd -o output.rrd

After:

$ rerun rrd compact --max-rows 4096 --max-bytes=1048576 /my/recordings/*.rrd -o output.rrd

$ rerun rrd compact --help

Compacts the contents of one or more .rrd/.rbl files and writes the result to a new file.

Uses the usual environment variables to control the compaction thresholds: `RERUN_CHUNK_MAX_ROWS`, `RERUN_CHUNK_MAX_ROWS_IF_UNSORTED`, `RERUN_CHUNK_MAX_BYTES`.

Unless explicit flags are passed, in which case they will override environment values.

Examples:

* `RERUN_CHUNK_MAX_ROWS=4096 RERUN_CHUNK_MAX_BYTES=1048576 rerun rrd compact /my/recordings/*.rrd -o output.rrd`

* `rerun rrd compact --max-rows 4096 --max-bytes=1048576 /my/recordings/*.rrd -o output.rrd`

Usage: rerun rrd compact [OPTIONS] --output <dst.(rrd|rbl)> [PATH_TO_INPUT_RRDS]...

Arguments:
  [PATH_TO_INPUT_RRDS]...


Options:
  -o, --output <dst.(rrd|rbl)>


      --max-bytes <MAX_BYTES>
          What is the threshold, in bytes, after which a Chunk cannot be compacted any further?

          Overrides RERUN_CHUNK_MAX_BYTES if set.

      --max-rows <MAX_ROWS>
          What is the threshold, in rows, after which a Chunk cannot be compacted any further?

          Overrides RERUN_CHUNK_MAX_ROWS if set.

      --max-rows-if-unsorted <MAX_ROWS_IF_UNSORTED>
          What is the threshold, in rows, after which a Chunk cannot be compacted any further?

          This specifically applies to _non_ time-sorted chunks.

          Overrides RERUN_CHUNK_MAX_ROWS_IF_UNSORTED if set.

  -h, --help
          Print help (see a summary with '-h')

• Part of Improvements to the RRD CLI tool #7048
• DNM: requires Improved CLI: support wildcard inputs for all relevant rerun rrd subcommands #7060

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