add optional cache

[p-hoffmann]

No description provided.

[Copilot]

Pull request overview

This PR adds optional TrexSQL caching functionality to WebAPI, providing an alternative vocabulary search provider that can serve searches from pre-built cache databases.

Key changes:

• Introduces TrexSQL integration components with conditional activation via configuration
• Adds new TREXSQL enum value to VocabularySearchProviderType
• Configures Maven dependency for trexsql-ext library with tcache profile support

Reviewed changes

Copilot reviewed 10 out of 11 changed files in this pull request and generated 17 comments.

Show a summary per file

File	Description
src/main/resources/application.properties	Adds Jackson date serialization config and TrexSQL configuration properties (enabled, cache-path, extensions-path)
src/main/java/org/ohdsi/webapi/vocabulary/VocabularySearchProviderType.java	Adds TREXSQL enum constant to support new search provider type
src/main/java/org/ohdsi/webapi/trexsql/TrexSQLSourceConfig.java	New configuration class for per-source TrexSQL settings (enabled flag, database code)
src/main/java/org/ohdsi/webapi/trexsql/TrexSQLServletConfig.java	Configures TrexServlet registration with conditional activation when trexsql.enabled=true
src/main/java/org/ohdsi/webapi/trexsql/TrexSQLService.java	Service layer providing TrexSQL operations including cache availability checking and vocabulary search
src/main/java/org/ohdsi/webapi/trexsql/TrexSQLSearchProvider.java	SearchProvider implementation that delegates vocabulary searches to TrexSQL cache
src/main/java/org/ohdsi/webapi/trexsql/TrexSQLInstanceManager.java	Singleton manager for TrexSQL instance with lazy initialization and thread-safe lifecycle management
src/main/java/org/ohdsi/webapi/trexsql/TrexSQLConfig.java	Main configuration class mapping trexsql.* properties with source-specific configurations
src/main/java/org/ohdsi/webapi/WebApi.java	Removes a line from javadoc comment (unrelated change)
pom.xml	Adds trexsql-ext dependency, JitPack repository, tcache profile, and logging configuration for tests
README.md	Adds trailing newline (formatting fix)

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