feat: Added ABNF Grammars field in Speech Adaptation

    * Added a new field to Speech Adaptation to specify ABNF grammar
      definitions

PiperOrigin-RevId: 499896786

google/cloud/speech/v1/resource.proto

@@ -120,19 +120,30 @@ message PhraseSet {
 
 // Speech adaptation configuration.
 message SpeechAdaptation {
+  message ABNFGrammar {
+    // All declarations and rules of an ABNF grammar broken up into multiple
+    // strings that will end up concatenated.
+    repeated string abnf_strings = 1;
+  }
+
   // A collection of phrase sets. To specify the hints inline, leave the
   // phrase set's `name` blank and fill in the rest of its fields. Any
   // phrase set can use any custom class.
   repeated PhraseSet phrase_sets = 1;
 
   // A collection of phrase set resource names to use.
   repeated string phrase_set_references = 2 [(google.api.resource_reference) = {
-                                               type: "speech.googleapis.com/PhraseSet"
-                                             }];
+    type: "speech.googleapis.com/PhraseSet"
+  }];
 
   // A collection of custom classes. To specify the classes inline, leave the
   // class' `name` blank and fill in the rest of its fields, giving it a unique
   // `custom_class_id`. Refer to the inline defined class in phrase hints by its
   // `custom_class_id`.
   repeated CustomClass custom_classes = 3;
+
+  // Augmented Backus-Naur form (ABNF) is a standardized grammar notation
+  // comprised by a set of derivation rules.
+  // See specifications: https://www.w3.org/TR/speech-grammar
+  ABNFGrammar abnf_grammar = 4;
 }

google/cloud/speech/v1p1beta1/resource.proto

@@ -120,21 +120,32 @@ message PhraseSet {
 
 // Speech adaptation configuration.
 message SpeechAdaptation {
+  message ABNFGrammar {
+    // All declarations and rules of an ABNF grammar broken up into multiple
+    // strings that will end up concatenated.
+    repeated string abnf_strings = 1;
+  }
+
   // A collection of phrase sets. To specify the hints inline, leave the
   // phrase set's `name` blank and fill in the rest of its fields. Any
   // phrase set can use any custom class.
   repeated PhraseSet phrase_sets = 1;
 
   // A collection of phrase set resource names to use.
   repeated string phrase_set_references = 2 [(google.api.resource_reference) = {
-                                               type: "speech.googleapis.com/PhraseSet"
-                                             }];
+    type: "speech.googleapis.com/PhraseSet"
+  }];
 
   // A collection of custom classes. To specify the classes inline, leave the
   // class' `name` blank and fill in the rest of its fields, giving it a unique
   // `custom_class_id`. Refer to the inline defined class in phrase hints by its
   // `custom_class_id`.
   repeated CustomClass custom_classes = 3;
+
+  // Augmented Backus-Naur form (ABNF) is a standardized grammar notation
+  // comprised by a set of derivation rules.
+  // See specifications: https://www.w3.org/TR/speech-grammar
+  ABNFGrammar abnf_grammar = 4;
 }
 
 // Transcription normalization configuration. Use transcription normalization