feat: add support for Swift Package Manager

[ricky641b]

New Pull Request Checklist

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

Issue Description

Related issue: #1453 Closes: #1453

Approach

Replace old dependency managers with SPM.

TODOs before merging

Tasks:

• [ ] Remove support for carthage
• [ ] Remove support for Cocoapods
• [ ] Add support for SPM

Optional (only if necessary to add SPM):

• [ ] Remove ParseFacebookUtils (incl. Facebook SDK dependency)
• [ ] Remove ParseTwitterUtils

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[mtrezza]

We cannot merge a PR that only removes something. The PR needs to include SPM support. That is also necessary for testing.

I renamed the PR title and description.

[mtrezza]

Closing as won't continue