Check for CSV/TSV format

[pcrxn]

Description of feature

The workflow currently returns a ERROR ~ Invalid CSV value -- offending line: error if a TSV file is provided to --input instead of a CSV file. For example:

ERROR ~ Invalid CSV value -- offending line: "S01Batch012022SPEIWastewaterReferenceSiteGillSwabOysterWildS1S34"	"S01_Batch01_2022S_PEI_WastewaterReferenceSite_GillSwab_Oyster_Wild_S1_S34_R1_001.fastq.gz"	"S01_Batch01_2022S_PEI_WastewaterReferenceSite_GillSwab_Oyster_Wild_S1_S34_R2_001.fastq.gz"

Make this error more verbose or implement a specific check for comma separation instead of tab separation.

[pcrxn]

There doesn't seem to be an obvious way to change this error message at the moment, unfortunately. I'll continue to monitor nf-schema development to see if this can be made more verbose in the future.