langchain

af8c5c18 - langchain[minor],community[minor]: Add async methods in BaseLoader (#16634)

langchain[minor],community[minor]: Add async methods in BaseLoader (#16634) Adds: * methods `aload()` and `alazy_load()` to interface `BaseLoader` * implementation for class `MergedDataLoader ` * support for class `BaseLoader` in async function `aindex()` with unit tests Note: this is compatible with existing `aload()` methods that some loaders already had. **Twitter handle:** @cbornet_ --------- Co-authored-by: Eugene Yurtsev <eugene@langchain.dev>