Server implements a Debug Adapter Protocol server that listens on a specific port, that operates on the vk::dbg::Context passed to the constructor.

Bug: b/145351270
Change-Id: If09d92c6d298cfbd71a7b2366b6b8407a728ec43
Reviewed-on: https://swiftshader-review.googlesource.com/c/SwiftShader/+/38899Reviewed-by: Nicolas Capens <nicolascapens@google.com>
Tested-by: Ben Clayton <bclayton@google.com>
Kokoro-Presubmit: kokoro <noreply+kokoro@google.com>