WIP: swiftgen prototype

[liamappelbe]

Current errors when trying to bind AVFoundation (these are errors found by swiftc in the swift2objc output):

/Users/liama/dev/native/pkgs/swiftgen/AVFoundationWrapper.swift:34:9: error: overriding declaration requires an 'override' keyword
  @objc init() {
        ^
        override
ObjectiveC.NSObject:5:12: note: overridden declaration is here
    public init()
           ^
/Users/liama/dev/native/pkgs/swiftgen/AVFoundationWrapper.swift:62:27: error: cannot find type 'InputSource' in scope
  init(_ wrappedInstance: InputSource) {
                          ^~~~~~~~~~~
/Users/liama/dev/native/pkgs/swiftgen/AVFoundationWrapper.swift:48:24: error: cannot find type 'InputSource' in scope
  var wrappedInstance: InputSource
                       ^~~~~~~~~~~
/Users/liama/dev/native/pkgs/swiftgen/AVFoundationWrapper.swift:990:20: error: overriding declaration requires an 'override' keyword
  @objc public var description: String {
                   ^
               override
ObjectiveC.NSObject:109:14: note: overridden declaration is here
    open var description: String { get }
             ^

Issues:

1. A few of those errors are missing about overrides. Looks like we need to detect when a generated method has the same name as a method on the super type and add override.
2. InputSource is AVCaptureDevice.InputSource, so I think the fix there is to add the AVCaptureDevice prefix.
3. Also, I'm having to manually add a import AVFoundation preamble. We should automatically add this import for module inputs.
4. Looking at the generated swift2objc output, we're also still missing most of the classes (eg AVPlayer), so it'd be good to figure out why they're not being generated.

#1393

[github-actions]

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Changelog Entry ❗

Package	Changed Files
package:ffigen	pkgs/ffigen/lib/ffigen.dart pkgs/ffigen/lib/src/config_provider.dart
package:swift2objc	pkgs/swift2objc/lib/src/config.dart pkgs/swift2objc/lib/swift2objc.dart
package:swiftgen	pkgs/swiftgen/bin/swiftgen.dart pkgs/swiftgen/lib/src/config.dart pkgs/swiftgen/lib/src/generator.dart pkgs/swiftgen/lib/src/util.dart pkgs/swiftgen/lib/swiftgen.dart pkgs/swiftgen/pubspec.yaml

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