feat: Implement Pipeline support

Adds support for pipelines, allowing streams to be chained together and
transformed.
This includes new types for `PipeStream` and `SourceAdapter`, along with
modifications
to the `Environment` to manage pipeline execution. A new example
`pipeline.myc`
demonstrates its usage.

src/ast/environment.rs

@@ -21,6 +21,8 @@ use crate::ast::types::{
     Identity, NodeIdentity, Object, Purity, SourceLocation, StaticType, Value,
 };
 
+pub type PipelineGenerator = Box<dyn FnMut() -> bool>;
+
 pub struct Environment {
     pub global_names: Rc<RefCell<HashMap<Symbol, (GlobalIdx, Identity)>>>,
     pub global_types: Rc<RefCell<HashMap<GlobalIdx, StaticType>>>,
@@ -33,7 +35,7 @@ pub struct Environment {
     pub debug_mode: bool,
     pub optimization: bool,
     pub macro_registry: Rc<RefCell<MacroRegistry>>,
-    pub pipeline_generators: Rc<RefCell<Vec<Box<dyn FnMut() -> bool>>>>,
+    pub pipeline_generators: Rc<RefCell<Vec<PipelineGenerator>>>,
 }
 
 struct EnvFunctionRegistry {
@@ -394,7 +396,9 @@ impl Environment {
             let compiled = self.compile(source)?;
             let linked = self.link(compiled);
             let func = self.instantiate(linked);
-            Ok((func.func)(vec![]))
+            let res = (func.func)(vec![]);
+            self.run_pipeline();
+            Ok(res)
         }
     }
 
@@ -423,6 +427,9 @@ impl Environment {
                 break;
             }
         }
+        
+        self.run_pipeline();
+        
         Ok((result, observer.logs))
     }
 }