Embed lib_InternalSwiftSyntaxParser.dylib into package

[Jeehut]

Problem Statement

Multiple issues have been raised already, it's time to fix them all: #179, #198, #200, #237, #245, #250.

Suggested Solution

Embed the library as suggested in documentation: https://github.com/apple/swift-syntax#embedding-swiftsyntax-in-an-application

[Jeehut]

See also: https://www.polpiella.dev/embedding-a-dylib-in-a-swift-package/

[Jeehut]

This has been done by the Apple team in SwiftSyntax itself (see this release) and version 4.12.1 uses that new version, so this should now be implemented as of 4.12.1.

[Jeehut]

Update: There still was a linking problem in 4.12.1 so I released 4.13.0 with a different approach, which worked. Therefore, this should be availble in 4.13.0 via Homebrew.