Support tvOS via SPM

[asshoffm]

Hi! 👋

This MR adds tvOS support to the distribution via SPM.

Because of the XIBs for tvOS, it is not trivial to have regular targets. Therefore, the framework is now built and distributed as a binary framework.

The import of Down is changed to @_implementationOnly for the SPM build since the compiler cannot resolve the dependency otherwise. See https://forums.swift.org/t/update-on-implementation-only-imports/26996.

The changes do not affect the distribution of cocoa pods and the existing binary frameworks.

For future updates, you only need to run the spm script which generates the SPM binaries.

The supported tvOS and iOS versions are also bumped for Xcode 14 compatibility.

[asshoffm]

@andresilveirah Did you already have some time to have a first look at the MR?

[andresilveirah]

Hi @asshoffm just got back from a looong vacation. Looking into your MR now.

[andresilveirah]

@asshoffm I know it's a bit of an effort, but do you mind opening a PR with only the changes necessary to introduce support to SPM for tvOS (ie. keeping iOS and tvOS minimum version down to 10, not running pod install nor the scripts to update/create the XCFrameworks).
It's not really feasible to review a 200+ files PR and it wouldn't be wise to merge it without a review and internal QA.

[asshoffm]

@andresilveirah Updated the MR 👍🏻 But to be able to test it, you now need to run the build script first.

[andresilveirah]

@asshoffm thank you, appreciate you taking the time to submit the PR. I moved the code with the generated XCFrameworks to a branch called internal_feature/tvos-spm. There's only a key difference, I rolled the minimum iOS and tvOS version back to .v10. I'd love to bump it to v11, but I'm not sure I can do that just yet. Is it a dealbreaker for you?

Can you give it a final try using branch internal_feature/tvos-spm on your SPM config and let me know if it all works for you? If it does, I'll merge the internal branch and have a new version of the SDK released (probably 7.4.2).

[asshoffm]

I tested your branch. On tvOS, we get the error sp_metric_error_invalid_JSON_encode_result.

However it should still prove that the framework is built and integrated correctly.

So yes, both iOS and tvOs work via SPM 👍🏻

[asshoffm]

@andresilveirah Are there still open points on your side?

[andresilveirah]

@asshoffm I've been fighting with XCode 15.0.1 for the last week or so. I was ready to merge, but decided to update XCode and after that the SPM XCFramework stopped archiving via command line.

I think I finally found a solution, just running final tests again and, if it's all good, I'll create a release today still.

[andresilveirah]

Everything seems to be working again with XCode 15.0.1. Closing in favour of #503 . That PR will be closed and we'll have a release today. Thank you @asshoffm .