Add phrase list support for speech recognizer

[wangfu91]

This pull request introduces support for phrase list in the speech recognizer module.

The main changes include the addition of the PhraseListGrammar type, its integration into the public API, and a new integration test to verify phrase list functionality.

See the doc here: Improve recognition accuracy with phrase list

A phrase list is a list of words or phrases provided ahead of time to help improve their recognition. Adding a phrase to a phrase list increases its importance, thus making it more likely to be recognized.

Also see the go library's PR here: microsoft/cognitive-services-speech-sdk-go#64

[Copilot]

Pull Request Overview

This PR adds phrase list support to the speech recognizer module, enabling users to improve recognition accuracy by providing specific words or phrases that are likely to be spoken. The main changes include implementing the PhraseListGrammar type with methods to add phrases and clear the list, integrating it into the public API, and adding comprehensive integration tests.

• Introduces PhraseListGrammar struct with add_phrase() and clear() methods
• Exposes the speech recognizer handle to enable grammar creation
• Adds integration test demonstrating phrase list functionality with audio file processing

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 2 comments.

File	Description
src/speech/phrase_list_grammar.rs	New module implementing PhraseListGrammar and internal GrammarPhrase structs
src/speech.rs	Exports the new PhraseListGrammar type in the public API
src/speech/speech_recognizer.rs	Changes handle visibility to pub(crate) for grammar integration
tests/integration_test.rs	Adds comprehensive integration test for phrase list functionality

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[adambezecny]

hi,

looking into it. give me some time to review.

regards

Adam

[adambezecny]

any reason for this change? please clarify

[wangfu91]

I made the field pub(crate) because in PhraseListGrammar::from_recognizer(), it needs to access the recognizer handle to create a PhraseListGrammar instance.

[adambezecny]

lgtm