Add lldb-dap to Swift distributions (llvm#88482)

This includes the lldb-dap executable in the MacOS and Linux
distributions of Swift. Currently there is a commit in the Apple repo to
do this for just MacOS swiftlang#8176.
This PR extends this to both Linux and MacOS and brings the change
upstream.

@JDevlieghere @adrian-prantl

Author: adam-fowler

lldb/cmake/caches/Apple-lldb-Linux.cmake

@@ -4,6 +4,7 @@ set(LLVM_DISTRIBUTION_COMPONENTS
   lldb
   liblldb
   lldb-argdumper
+  lldb-dap
   lldb-server
   lldb-python-scripts
   repl_swift