Add create-ticker function

Implements the `create-ticker` function, which allows for the creation
of a ticker stream based on a provided condition closure. This function
is crucial for synchronizing pipeline execution based on specific events
or conditions.

examples/pipeline_script_ticker.myc

@@ -0,0 +1,48 @@
+;; Benchmark: 2.0us
+;; Benchmark-Repeat: 1015
+;; Output: PipelineNode[last: Some(110.45243843391206)]
+
+(do
+  ;; Set the random seed to match the existing test output exactly
+  (seed! 42)
+
+  ;; Use our new generic create-ticker to pulse 3 times
+  (def cnt 3)
+  (def ticker (create-ticker (fn [] (> (assign cnt (- cnt 1)) -1))))
+
+  ;; The candle generator reacting to the ticker
+  (def last-close 100.0)
+  
+  (def src1
+    (pipe [ticker]
+      (fn [_]
+        (do
+          (def change (* (- (random) 0.5) 2.0)) ; Matches Rust: (rng.f64() - 0.5) * 2.0
+          (def open last-close)
+          (def high (+ open (abs (* (random) 2.0))))
+          (def low (- open (abs (* (random) 2.0))))
+          (assign last-close (+ open change))
+          {:open open :high high :low low :close last-close}
+        )
+      )
+    )
+  )
+
+  (def combined
+    (pipe [src1]
+      (fn [t1]
+        (.close t1)
+      )
+    )
+  )
+
+  (def my_indicator
+    (pipe [combined]
+      (fn [close_price]
+        (+ close_price 10.0)
+      )
+    )
+  )
+  
+  my_indicator
+)