fix(iOS): properly handle date types during JSValue coercion

[theproducer]

This PR fixes a missing case in coerceToJSValue in which NSDate values were not being returned, resulting in nil values.

Example:

const mydate = new Date();
const result = await ExamplePlugin.testMethod({ date: mydate });

@objc func testMethod(_ call: CAPPluginCall) {
         // date will be nil
        let date = call.getDate("date")
        
       
        if let date = date {
            print("Date: \(date)")
        }
    }

[ikeith]

Looks good; just some minor changes. And please remove the unrelated whitespace diffs, if possible.

[ikeith]

Looks good. The type bridging actually has a lot of test coverage (the exception in the project) so it'd be good to update the unit tests to verify the additional date handling. But that can be addressed in a separate branch.