Adding changes for local build script and cmakelist to create exe using swift package

[absaroj]

Changes in local build script and cmakelist file to build swift wrappers package for local sample main.swift file.

Below tasks are done by the cmakelist file:

1. Locate all the required static libs.
2. Run swift build to build swift wrappers package.
3. Combine all object files from swift wrappers to make a static lib.
4. Invoke swiftc compiler to compile the sample swift code while including the modules (wrappers and objc)
   and linking the static libs to generate the executable.

[lalitb]

Can we integrate these build steps with root CMakeLists.txt, and let it build whenever the iOS build is triggered ? This will also let this build trigger from CI.

[absaroj]

Can we integrate these build steps with root CMakeLists.txt, and let it build whenever the iOS build is triggered ? This will also let this build trigger from CI.

Yeah. I have added the changes to compile the swift wrappers as part of the global build. That is in separate PR.

[lalitb]

Force merge it. The CI failure is not related to this PR.