Add multiple output options

[priyanka-surana]

Description of feature

To close this issue:

1. Add a new parameter --outfmt which takes values bam or cram, and a new parameter --compression which takes values none or crumble. User can pass multiple options separated by a ,.
2. In the main workflow or the input_check sub-workflow, parse and validate the parameter values, and pass these to the convert_stats sub-workflow.
3. Configure the convert_stats sub-workflow to only run CRUMBLE if --compression crumble is passed, and to only run SAMTOOLS_VIEW if --outfmt cram is passed.
4. Run tests to make sure --outfmt works as expected.
5. Update the documentation.

[muffato]

crumble works on BAM files too, so the choices are 1) BAM vs CRAM, 2) original scores vs compressed scores (crumble)