feat: derivatives open-interest, flow & liquidation indicators (part 2 of 3) (#127)
* feat(derivatives): OIPriceDivergence indicator (core)
* feat(derivatives): OIWeighted indicator (core)
* feat(derivatives): LongShortRatio indicator (core)
* feat(derivatives): TakerBuySellRatio indicator (core)
* feat(derivatives): LiquidationFeatures multi-output indicator (core)
* feat(derivatives): Python, Node and WASM bindings for OI, flow & liquidation indicators
* test(derivatives): Python and Node tests for OI, flow & liquidation indicators
* fuzz(derivatives): drive OI, flow & liquidation indicators in derivatives target
* docs(derivatives): README row + counter 237->242, CHANGELOG part 2