feat(attachments): add attachment mapping file support

[grantfitzsimmons]

Fixes #4766

Realized that previously implemented logic covered most of the cases. We already supported matching files to previously selected files. So, now, we just make a new attachment dataset based on the selected csv. When user selects files, they will be matched to this dataset (which is based on csv) so we just preserve the parsed name.

I'll add more automated tests for this before making this open for review for everything seems to be working!

EDIT: I based it off @melton-jason coge-import because I realized I could reuse some of that code. I'm still considering directly using workbench's implementation though

Checklist

• Self-review the PR after opening it to make sure the changes look good and
  self-explanatory (or properly documented)
• Add relevant issue to release milestone
• Add pr to documentation list
• Add automated tests
• Add a reverse migration if a migration is present in the PR
• Add migration function to

  specify7/specifyweb/specify/management/commands/run_key_migration_functions.py

  Line 50 in ea04665

  def fix_schema_config(stdout: WriteToStdOut | None = None):

Testing instructions