Update NS_ENUM and Add Swift Package Manager Support

[paulsolt-ofsw]

Exposes all enum using NS_ENUM and adds support for Swift Package Manager (SPM). This is a breaking code change.

ngageoint/simple-features-ios#7

• Updates logic to use NS_ENUM (Simple Features 5.0.0) for all enums for Swift/Objective-C interoperability (breaking changes)
• Updates header imports to use module style imports with angular brackets
• Separates Swift and Objective-C unit tests with shared core logic
• Updates GitHub workflows for SPM

[danbenner-vega]

Not sure about the "bug" you might have found, but I'm also not concerned with that test you commented most of it out. Approved.

[brentvegafederal]

Approved but don't forget to update Package.swift

[paulsolt-ofsw]

@danbenner-vega I left some debug commented code in SFGFeatureCollectionTestCase.m from when I was figuring out bundle loading logic for tests. I've cleaned it up, since I wrote a new method to use SWIFTPM_MODULE_BUNDLE which will convert to a proper path on SPM.

- (NSBundle *)getBundle {
#if SWIFT_PACKAGE
    return SWIFTPM_MODULE_BUNDLE;
#else
    return [NSBundle bundleForClass:[SFGFeatureCollectionTestCase class]];
#endif
}