Add Swift Package Manager Support (closes #80)

[Gustl22]

Description

Closes #80

[diegotori]

@Gustl22 thanks for your pending changes. Once they're out of draft, then I'll start running automation against them.

[Gustl22]

Just need to try, if my changes actually work ^^ ;D

[Gustl22]

Seems to compile, can't really test, as there's a limitation with the simulator that it does not go into sleep by itself (and I don't have a real device):
https://stackoverflow.com/questions/10955942/how-to-simulate-iphone-being-put-to-sleep-in-ios-simulator

I can come back with the results in a few days, or you can test for yourself. But as it compiles and the logic hasn't changed it should most likely work.

[diegotori]

Seems to compile, can't really test, as there's a limitation with the simulator that it does not go into sleep by itself (and I don't have a real device): https://stackoverflow.com/questions/10955942/how-to-simulate-iphone-being-put-to-sleep-in-ios-simulator

That's definitely a known issue. You'll need a real device to verify that it works. As long as you're able to get to the method channel from iOS regardless of device, then that suffices for this PR.

[diegotori]

@Gustl22 Looks like you need to apply Dart formatting.

[Gustl22]

I did a reformat, hopefully that was everything, that was missing.

[diegotori]

@Gustl22 please fix the Deprecations that they're asking about. Thanks.

[Gustl22]

The deprecation is not part of the SPM change, I created #92 for that.

[diegotori]

Please re-sync your changes with main, since I published your win32 changes. Thanks.

[Gustl22]

@diegotori thanks 🙏 i updated this branch 👍

[Gustl22]

Just as note: This change passed our internal test.

[diegotori]

@Gustl22 understood. I'll release this as a new minor version later today. Thanks for your contribution.

[Gustl22]

Awesome thank you for maintaining!

[diegotori]

@loic-sharma Please let me know if this SPM integration looks good to you. Thanks.

Before I approve it, if you're happy with it, then I am too.