Change arg name `--norm-output` for `autometa-kmers` entrypoint

[chasemc]

Don't change this yet, but the following argument name is confusing. It's an input path to a tsv of normalized kmer counts but is named norm-output.

Autometa/autometa/common/kmers.py

Lines 736 to 740 in baf61c0

	parser.add_argument(
	"--norm-output",
	help=f"Path to normalized kmers table (will skip if file exists)",
	metavar="filepath",
	)

The command's output file path is also named ...-output:

Autometa/autometa/common/kmers.py

Lines 758 to 762 in baf61c0

	parser.add_argument(
	"--embedding-output",
	help=f"Path to write embedded kmers table (will skip if file exists)",
	metavar="filepath",
	)

[chasemc]

I'm making a couple edits to this file elsewhere, so wait until those are merged before addressing this

[evanroyrees]

NOTE: These are both input and outputs paths. If the paths do not exist, autometa-kmers will write the respective files to the specified paths.