feat(discoveryengine): add search, autocomplete and schema services

[gcf-owl-bot]

• Regenerate this pull request now.

feat: add unstructured document support (PDF/HTML)
docs: keep the API doc up-to-date with recent changes

PiperOrigin-RevId: 526041628

Source-Link: googleapis/googleapis@cb802d9

Source-Link: https://github.com/googleapis/googleapis-gen/commit/ce94886f16aedfea80d5cfb49f3eac8bbeddef66
Copy-Tag: eyJwIjoiLmdpdGh1Yi8uT3dsQm90LnlhbWwiLCJoIjoiY2U5NDg4NmYxNmFlZGZlYTgwZDVjZmI0OWYzZWFjOGJiZWRkZWY2NiJ9

[snippet-bot]

Here is the summary of changes.

You are about to add 13 region tags.

• internal/generated/snippets/discoveryengine/apiv1beta/CompletionClient/CompleteQuery/main.go:17, tag discoveryengine_v1beta_generated_CompletionService_CompleteQuery_sync
• internal/generated/snippets/discoveryengine/apiv1beta/CompletionClient/GetOperation/main.go:17, tag discoveryengine_v1beta_generated_CompletionService_GetOperation_sync
• internal/generated/snippets/discoveryengine/apiv1beta/CompletionClient/ListOperations/main.go:17, tag discoveryengine_v1beta_generated_CompletionService_ListOperations_sync
• internal/generated/snippets/discoveryengine/apiv1beta/SchemaClient/CreateSchema/main.go:17, tag discoveryengine_v1beta_generated_SchemaService_CreateSchema_sync
• internal/generated/snippets/discoveryengine/apiv1beta/SchemaClient/DeleteSchema/main.go:17, tag discoveryengine_v1beta_generated_SchemaService_DeleteSchema_sync
• internal/generated/snippets/discoveryengine/apiv1beta/SchemaClient/GetOperation/main.go:17, tag discoveryengine_v1beta_generated_SchemaService_GetOperation_sync
• internal/generated/snippets/discoveryengine/apiv1beta/SchemaClient/GetSchema/main.go:17, tag discoveryengine_v1beta_generated_SchemaService_GetSchema_sync
• internal/generated/snippets/discoveryengine/apiv1beta/SchemaClient/ListOperations/main.go:17, tag discoveryengine_v1beta_generated_SchemaService_ListOperations_sync
• internal/generated/snippets/discoveryengine/apiv1beta/SchemaClient/ListSchemas/main.go:17, tag discoveryengine_v1beta_generated_SchemaService_ListSchemas_sync
• internal/generated/snippets/discoveryengine/apiv1beta/SchemaClient/UpdateSchema/main.go:17, tag discoveryengine_v1beta_generated_SchemaService_UpdateSchema_sync
• internal/generated/snippets/discoveryengine/apiv1beta/SearchClient/GetOperation/main.go:17, tag discoveryengine_v1beta_generated_SearchService_GetOperation_sync
• internal/generated/snippets/discoveryengine/apiv1beta/SearchClient/ListOperations/main.go:17, tag discoveryengine_v1beta_generated_SearchService_ListOperations_sync
• internal/generated/snippets/discoveryengine/apiv1beta/SearchClient/Search/main.go:17, tag discoveryengine_v1beta_generated_SearchService_Search_sync

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