feat: rsem-generate-data-matrix for genes & isoforms

[kelly-sovacool]

Changes

Add rsem_data_matrix rule to output data matrices for genes & isoforms as DEG_ALL/RSEM.genes.expected_count.all_samples.matrix and DEG_ALL/RSEM.isoforms.expected_count.all_samples.matrix. This info is already contained in DEG_ALL/RSEM.isoforms.expected_count.all_samples.txt, but some users need RSEM's matrix format for downstream tools.

Issues

resolves #137

PR Checklist

(Strikethrough any points that are not applicable.)

• This comment contains a description of changes with justifications, with any relevant issues linked.
• Update docs if there are any API changes.
• Update CHANGELOG.md with a short description of any user-facing changes and reference the PR number. Guidelines: https://keepachangelog.com/en/1.1.0/

[samarth8392]

Do we need to do a full run to check if this works? because otherwise this looks good to me.
Edit: Once we merge this, i will update the docs to include the matrix file.