Simplified ExESDB configuration module using automatic OTP app discovery.

This module dramatically reduces complexity by:

1. Automatically discovering the calling application
2. Using a macro to generate config functions with less duplication
3. Providing sensible defaults and environment variable overrides

Usage: # Automatic discovery (recommended) ExESDB.Options.data_dir() # Discovers calling app automatically

# Explicit app specification ExESDB.Options.data_dir(:my_app)

# Context-based (for umbrella apps) ExESDB.Options.with_context(:my_app, fn ->

ExESDB.Options.data_dir()    # Uses :my_app context

end)