feat(ao-histogram): add Awesome Oscillator Histogram

AO - SMA(AO, sma_period). A configurable variant of the existing
AcceleratorOscillator (which fixes fast=5, slow=34, sma=5).
Three parameters; defaults match Bill Williams' Accelerator.

Touchpoints: awesome_oscillator_histogram.rs + mod.rs + lib.rs
re-export, PyAoHist + __init__.py + test_new_indicators CANDLE_SCALAR
+ test_known_values flat reference, AwesomeOscillatorHistogramNode +
index.d.ts/index.js + indicators.test.js factory + reference,
WasmAoHist, candle-fuzz target, README + CHANGELOG.

bindings/python/tests/test_new_indicators.py

@@ -139,6 +139,10 @@ CANDLE_SCALAR = {
         lambda: ta.AcceleratorOscillator(5, 34, 5),
         lambda ind, h, l, c, v: ind.batch(h, l),
     ),
+    "AwesomeOscillatorHistogram": (
+        lambda: ta.AwesomeOscillatorHistogram(5, 34, 5),
+        lambda ind, h, l, c, v: ind.batch(h, l),
+    ),
     "BalanceOfPower": (
         # The streaming 6-tuple feeds open == close, so batch matches with
         # the close column standing in for open.