feat: auto-detect `.tsv`/`.tab` and apply `-t`

[lovetts-evyn]

The standard file extensions for a TSV are .tsv and .tab.

zsv commands where the argument is a .tsv or .tab file should choose the -t option by default.

Current

> zsv pretty data/tysto.tsv | head -n 5
uk	us
accessorise	accessorize
accessorised	accessorized
accessorises	accessorizes
accessorising	accessorizing

Expected

> zsv pretty data/tysto.tsv | head -n 5
uk              |us
accessorise     |accessorize
accessorised    |accessorized
accessorises    |accessorizes
accessorising   |accessorizing

The expected output was produced using zsv pretty -t data/tysto.tsv

[liquidaty]

I think that assuming .tsv = tab-delimited is definitely fine... have to think a bit more re .tab