Filter out clonotypes with non-coding, coding, in-frame or out-of-frame CDR3 sequences:
`coding()` - remove all non-coding sequences (i.e., remove all sequences with stop codons and frame shifts);
`noncoding()` - remove all coding sequences (i.e., leave sequences with stop codons and frame shifts only);
`inframes()` - remove all out-of-frame sequences (i.e., remove all sequences with frame shifts);
`outofframes()` - remove all in-frame sequences (i.e., leave sequences with frame shifts only).
Note: the function will remove all clonotypes sequences with NAs in the CDR3 amino acid column.