Add function to detect peak annotation DataFormat

[lparsons]

Summary Change Description

Adds a function that detects the DataFormat of a peak annotation file.

Affected Issues/Pull Requests

• Resolves #958

  See comments in-line.

  Checklist

  This pull request will be merged once the following requirements are met. The author and/or reviewers should uncheck any unmet requirements:

  • Review requirements
    • Minimum approvals: 1
    • No changes requested
    • All blocking issues resolved by reviewers
    • Specific reviewers: @add_username_here
    • Review period: 2 days
  • Associated issue/pull request requirements:
    • [x] All requirements in affected issues marked "resolved" are satisfied
    • [x] All required pull requests are merged (or none)
  • Basic requirements
    • [x] All linters pass
    • [x] All tests pass
    • [x] All conflicts resolved
  • Overhead requirements
    • [x] New/changed method tests implemented/updated (or no change)
    • [ ] Updated Unreleased section of changelog.md (or no change)
    • [x] Migrations created & committed (or no change)