TruLens v2.1.4

What's Changed

• add trulens-apps-langgraph to optional requirements by @sfc-gh-jreini in #2159
• Update Langgraph version requirements to ensure we instrument TaskFunction / _TaskFunction by @sfc-gh-dhuang in #2160
• [Snowflake] Live OTEL tracing with Snowflake Run by @sfc-gh-dhuang in #2158
• custom attribute instrumentation + langgraph instrumentation docs by @sfc-gh-jreini in #2161
• add openai gpt-oss example by @sfc-gh-jreini in #2162

Full Changelog: trulens-2.1.2...trulens-2.1.4