File-based document loader implementation following LangChain's document loading patterns Integrates with the core document splitting functionality for processing text files.

Example usage:

-- Load a document from file
loader = FileLoader "data.txt"
docs <- load loader
-- Right [Document {pageContent = "File content", metadata = ...}]

-- Load and split document content
chunks <- loadAndSplit loader
-- Right ["First paragraph", "Second paragraph", ...]