IREE Static Library Loader Runtime Demo (dylib-llvm-aot backend) (#6225)

This sample shows how to:

Produce a static library and bytecode module with IREE's compiler
Compile the static library into a program using the static_library_loader
Run the demo with the module using functions exported by the static library
The model compiled into the static library exports a single function simple_mul that returns the multiplication of two tensors. README.md includes full details on building and running the demo.

The sample is enabled through the IREE_BUILD_SAMPLES flag. Its tested/running on linux running the dylib-llvm-aot backend.

Fixes #5666