upgrade: replace Kronos-small weights with Kronos-base (102.3M)

fix: remove .dt accessor from DatetimeIndex in kronos.py

fix: remove .dt accessor from DatetimeIndex

Add Kronos-Tokenizer-base and fix handler

Fix handler: use native Kronos model instead of ChronosPipeline

Add real Kronos custom endpoint handler

Add custom handler and requirements

Add Kronos-small model with custom handler

initial commit