This commit fixes the following warnings in the Ruby tests:
```console
/whisper/bindings/ruby/tests/test_segment.rb:52:
warning: ambiguity between regexp and two divisions:
wrap regexp in parentheses or add a space after `/' operator
```
And also adds a '_' prefix to some unused variables to avoid warnings.
* 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
