fix(identity): dead lock when setting same user id

[gierschv]

Changes in this pull request

When calling Superwall.shared.identify(userId: "abc") when opening app instead of only during login, IdentityManager.didSetIdentity is never execute since the queue is stuck. Bug repro: set identity in AppDelegate and open app twice (works first time, fails afterwards).

This bug also blocks future calls to Superwall.shared.getPresentationResult that never returns since identityManager.hasIdentity is always false in AwaitIdentifyOperator, and never opens future paywalls.

Checklist

• [ ] All tests pass. Demo project builds and runs.
• [ ] I added tests, an experiment, or detailed why my change isn't tested. -> Not sure about testing, I don't see any tests calling identify().
• [ ] I added an entry to the CHANGELOG.md for any breaking changes, enhancements, or bug fixes.
• [x] I have run swiftlint in the main directory and fixed any issues.
• [ ] I have updated the SDK documentation as well as the online docs.
• [x] I have reviewed the contributing guide

[yusuftor]

This is a real bug! Thanks for the detailed report and pull request. I've changed this to merge to our develop branch before we release to master with other upcoming fixes. We actually have some UITests (not included in this project), but we don't have a UITest that identifies with the same userId, so we'll add that in.