v1.4.0

• Made pygam an optional dependency that can be installed with pip install palantir[gam] or pip install palantir[full]
• Added proper conditional imports and improved error handling for pygam
• Enhanced run_magic_imputation to return appropriate data types for different inputs
• Updated code to use direct AnnData imports for newer compatibility
• Improved version detection using importlib.metadata with graceful fallbacks
• Fixed Series indexing deprecation warnings in early cell detection functions
• Expanded and standardized documentation with NumPy-style docstrings throughout the codebase
• Added comprehensive type hints to improve code quality and IDE support
• Remove dependency from _ methods in scanpy for plotting.
• add pseudotime_interval argument to control path length in palantir.plot.plot_trajectory