Add a GeoURI formatter

[hishma]

This PR add a new formatter that converts between CLLocation types and their GeoURI representations as defined by rfc5870.

You can verify this in the Swift REPL

% swift run --repl
Building for debugging...
[2/2] Compiling plugin Swift-DocC Preview
Build complete! (0.19s)
Launching Swift REPL with arguments: repl -I/Users/jeffj/Developer/sss/LocationFormatter/.build/arm64-apple-macosx/debug -L/Users/jeffj/Developer/sss/LocationFormatter/.build/arm64-apple-macosx/debug -llocationformatter__REPL
Welcome to Apple Swift version 5.9.2 (swiftlang-5.9.2.2.56 clang-1500.1.0.2.5).
Type :help for assistance.
  1> import LocationFormatter
  2> import CoreLocation
  3> let formatter = GeoURILocationFormatter()
  4> let location = formatter.location(from: "geo:48.11638,-122.77527")
  5> location.description
$R0: String = "<+48.11638000,-122.77527000> +/- 0.00m (speed -1.00 mps / course -1.00) @ 1/7/24, 12:09:18 Pacific Standard Time"
  6> formatter.string(fromLocation: location)
$R1: String? = "geo:48.11638,-122.77527"

  7> formatter.options.insert(.includeCRS)
  8> formatter.string(fromLocation: location) 
$R3: String? = "geo:48.11638,-122.77527;crs=wgs84"
  9> :quit

[toddheasley]

Is there a use case for both case sensitive and insensitive parsing? What other parsing options could there be?

[hishma]

Well the spec says it should be case insensitive, but prefer lower case. But I was thinking it might make sense to let the user determine the behavior to fit their use case.

Future iterations could also support some unofficial extensions that other systems use (looking at you android).