ruby : fix bindings (#2484)

* Improve Rakefile

* Remove intermediate files

* Remove unnecessary manipulations from extconf.rb

* Add README and LINCENSE to source files

* Manage ext source files using YAML file

* Use extsources.yaml to include files into gem package file

* Add git-managed source files to build dependency

* Add test task

* Download model for test if not exists

* Add test for build

* Ignore gem package directory

* Enable GitHub action for Ruby binding

* Fix model name

* Build lib file for test

* Use extension for each platform

* Use extension for each platform on testing

* Move built lib file rather than copy

* Add intermediate files to clean targets

bindings/ruby/ext/.gitignore

@@ -3,7 +3,26 @@ ggml.c
 ggml.h
 ggml-alloc.c
 ggml-alloc.h
-whisper.bundle
+ggml-aarch64.c
+ggml-aarch64.h
+ggml-backend.cpp
+ggml-backend-impl.h
+ggml-backend.c
+ggml-backend.h
+ggml-common.h
+ggml-cpu-impl.h
+ggml-cuda.h
+ggml-impl.h
+ggml-kompute.h
+ggml-metal.h
+ggml-opencl.h
+ggml-quants.c
+ggml-quants.h
+ggml-sycl.h
+ggml-vulkan.h
 whisper.cpp
 whisper.h
 dr_wav.h
+whisper.bundle
+whisper.so
+whisper.dll