feat: derivatives funding & open-interest indicators (part 1 of 3) (#126)

* feat(derivatives): DerivativesTick input type + InvalidDerivatives error

* feat(derivatives): FundingRate indicator (core)

* feat(derivatives): FundingRateMean indicator (core)

* feat(derivatives): FundingRateZScore indicator (core)

* feat(derivatives): FundingBasis indicator (core)

* feat(derivatives): OpenInterestDelta indicator (core)

* feat(derivatives): Python, Node and WASM bindings for funding & OI-delta indicators

* test(derivatives): Python and Node tests for funding & OI-delta indicators

* bench(derivatives): synthetic-tick bench + derivatives fuzz target

* docs(derivatives): README family row + counter 232->237, CHANGELOG entry

fuzz/Cargo.toml

@@ -73,6 +73,13 @@ test = false
 doc = false
 bench = false
 
+[[bin]]
+name = "indicator_update_derivatives"
+path = "fuzz_targets/indicator_update_derivatives.rs"
+test = false
+doc = false
+bench = false
+
 [[bin]]
 name = "tick_aggregator"
 path = "fuzz_targets/tick_aggregator.rs"