What kind of change does this PR introduce?

• Bugfix
• Feature
• Docs
• New Binding issue #___
• Code style update
• Refactor
• Build-related changes
• Other, please describe:

Does this PR introduce a breaking change?

• Yes
• No

Checklist

• When resolving issues, they are referenced in the PR's title (e.g fix: remove a typo, closes #___, #___)
• A change file is added if any packages will require a version bump due to this PR per the instructions in the readme.
• I have added a convincing reason for adding this feature, if necessary

Other information

This PR changes the plugin command API to enforce typed arguments instead of relying on on-demand argument processing via invoke.getString, invoke.getInt, invoke.getObject etc.

New API for Android:

class Options(val recursive: Boolean = false)

class ExampleArgs(val path: String?, val options: Options?, val enabled: Boolean = true)

@TauriPlugin
class ExamplePlugin(private val activity: Activity): Plugin(activity) {
    @Command
    fun run(invoke: Invoke) {
        val args = invoke.parseArgs(ExampleArgs::class.java)
        invoke.resolveObject(args)
    }
}

New API for iOS:

class Options: Decodable {
  let recursive: Bool = false
}

class ExampleArgs: Decodable {
  let path: String?
  let enabled: Bool = true
  let options: Options?
}

class ExamplePlugin: Plugin {
  @objc public func run(_ invoke: Invoke) throws {
    let args = try invoke.parseArgs(ExampleArgs.self)
    invoke.resolve(args)
  }
}

Note that you can also resolve with an object instead of the generic JSObject class / dictionary.