Refactor: Simplify CCI calculation
Objective: The primary aim of this change is to align the CCI to be more closely with the TradingView style. By eliminating the CCI class and converting all its methods into a simple function, the code will better adhere to the coding conventions and patterns utilized in the TradingView platform.
**Full Changelog**: https://github.com/m-marqx/TradingView-Indicators/compare/v0.0.4...v0.0.7.1