feat: Upgrade to Facebook SDK 13 via SPM

[drdaz]

New Pull Request Checklist

• [x] I am not disclosing a vulnerability.
• [x] I am creating this PR in reference to an issue.

Issue Description

Facebook SDK compatibility. Moves to SPM for internal dependency management.

Closes https://github.com/parse-community/Parse-SDK-iOS-OSX/issues/1635

Approach

Removed most of the mishmash of other approaches to internal dependency management, and replaced it with SPM. Updated FB lib version to 13.

TODOs before merging

• [ ] Add entry to changelog
• [ ] Add changes to documentation (guides, repository pages, in-code descriptions)

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[mtrezza]

Pretty nice that this also moves to SPM; do you think you could bring this up-to-date so we can merge it? Or is there any obstacle left in this PR?

[mtrezza]

Closing in favor of https://github.com/parse-community/Parse-SDK-iOS-OSX/pull/1683