feat: add Sequence.each method to iterate over elements with a function

Add a new `each` method to the Sequence class in the Wren programming language,
allowing iteration over sequence elements by passing each element to a provided
function. This replaces the previous pattern of using `map` with `Fiber.yield`
in examples, providing a more direct and idiomatic way to perform side effects
per element. The implementation includes a core library method in `core.wren`,
a C source string in `wren_core.c`, documentation in the Sequence markdown file,
and three test cases covering normal iteration, empty sequences, and non-function
argument error handling.

doc/site/core/sequence.markdown

@@ -54,6 +54,13 @@ and counting the number of times the returned value evaluates to `true`.
     [1, 2, 3].count {|n| n > 2} // 1.
     [1, 2, 3].count {|n| n < 4} // 3.
 
+### **each**(function)
+
+Iterates over the sequence, passing each element to the given `function`.
+
+    :::dart
+    ["one", "two", "three"].each {|word| IO.print(word) }
+
 ### **join**(sep)
 
 Returns a string representation of the list. The string representations of the

doc/site/index.markdown

@@ -15,7 +15,7 @@ a familiar, modern [syntax][].
     }
 
     var adjectives = new Fiber {
-      ["small", "clean", "fast"].map {|word| Fiber.yield(word) }
+      ["small", "clean", "fast"].each {|word| Fiber.yield(word) }
     }
 
     while (!adjectives.isDone) IO.print(adjectives.call())
@@ -52,4 +52,4 @@ If you like the sound of this, [give it a try][try]! Even better, you can
 [fibers]: fibers.html
 [embedding]: embedding-api.html
 [try]: getting-started.html
-[contribute]: contributing.html
+[contribute]: contributing.html