ENH, BUG: enhancements and bug fixes across the lidar profile evaluation codebase

[isilber]

This pull request introduces several enhancements and fixes across the lidar profile evaluation codebase, focusing primarily on improving the deadtime correction logic for lidar signals, increasing configurability, updating plotting and I/O conventions, and extending the CLI for more flexible output management.

• The apply_deadtime_correction function now supports configurable polynomial extrapolation in log-log space for count rates above the LUT maximum

• The code now consistently uses range instead of range_bins as the coordinate name in output datasets and plotting, improving compatibility.

• The CLI in real_prof_main.py now supports an --output-path argument, allowing users to specify the output directory for exported files. This is integrated into the export logic. [1] [2]

*Plotting and Utility Improvements

• Added a new field w_variance to the dlwindstat configuration, enabling support for vertical wind variance data.
• Added "pblhtbeml" to the list of supported instruments (add the RM PBLH best estimate ML data (lightGBM array)