[JExtract] Support `typealias`

[rintaro]

public struct Bytes {
  public typealias Element = Int8
  public func append(_ element: Element)
}

Bytes.append(_:) should be translated to void append(java.lang.Byte element)

To do that JExtract should support typealias declaration.

[rintaro]

This should also fix this:

swift-java/Sources/JExtractSwiftLib/SwiftTypes/SwiftKnownModules.swift

Lines 81 to 82 in 7f24d62

	// FIXME: Support 'typealias Void = ()'
	public struct Void {}