ruby : Add low-level methods to transcribe (#2585)

* Add tests for Whisper::Context#full

* Add Whisper::Context#full

* Add tests for Whisper::Error

* Add document of Whisper::Context#full [skip ci]

* Add additional signature for Whisper::Context#full

* Add description to Whisper::Context#full

* Add test for Whisper::Context#full_parallel

* Add Whisper::Context#full_parallel

* Hide Whisper's instance methods from Ruby code

* Add class to test MemoryView

* Build test class before running test

* Add test for MemoryView

* Make Whisper::Context#full and #full_parallel accept MemoryView

* Use Ruby 3.1 on CI

* Add comment on samples data type

* Update README

* Update README

* Remove unused code

.github/workflows/bindings-ruby.yml

@@ -50,6 +50,6 @@ jobs:
     steps:
       - uses: ruby/setup-ruby@v1
         with:
-          ruby-version: '3.0'
+          ruby-version: '3.1'
       - uses: actions/checkout@v4
       - run: rake test