Update various types to use their own definitions

This commit refactors several modules to use the defined types from
`ast::types` and `ast::nodes` directly, rather than using fully
qualified paths. This improves code readability and reduces redundancy.

Specifically, the following changes were made:

- In `analyzer.rs`, `crate::ast::types::Identity` and
  `crate::ast::types::Purity` are now used directly.
- In `binder.rs`, `crate::ast::types::NodeIdentity`,
  `crate::ast::types::SourceLocation`,
  `crate::ast::types::RecordLayout`, and `crate::ast::types::Value` are
  now used directly.
- In `macros.rs`, types like `Address`, `VirtualId`, `NodeIdentity`,
  `SourceLocation`, `StaticType`, and `Purity` are now used directly.
- In `optimizer/engine.rs`, `Address<VirtualId>` is now used directly.
- In `type_checker.rs`, `BoundPhase`, `Signature`, `Keyword`, and
  `RecordLayout` are now used directly.
- In `environment.rs`, `CompilerScope`, `LocalInfo`, `CapturePass`,
  `AnalyzedPhase`, `NativeFunction`, and `Closure` are now used
  directly.
- In `nodes.rs`, `RecordLayout`, `Keyword`, `Purity`, and `StaticType`
  are now used directly.
- In `parser.rs`, `SourceLocation` and `NodeIdentity` are now used
  directly.
- In `rtl/math.rs`, `NativeFunction`, `Purity`, `Signature`,
  `StaticType`, `Value`, `RefCell`, and `Rc` are now used directly.
- In `rtl/streams.rs`, `ScalarValue`, `SeriesMember`, `Object`,
  `PipeFn`, `Value`, `VM`, `RingBuffer`, `RecordSeries`, `SeriesView`,
  `build_map_stream`, and `build_pipeline_node` are now used directly.
- In `rtl/type_registry.rs`, `RecordLayout`, `Keyword`, `Purity`,
  `Signature`, `StaticType`, and `Value` are now used directly.
- In `vm.rs`, `RecordSeries`, `SeriesView`, `build_map_stream`,
  `build_pipeline_node`, `StreamNode`, `Object`, and `PipeFn` are now
  used directly.
- In `utils/tester.rs`, `TypedNode` is now used directly.

src/ast/compiler/binder.rs

@@ -4,7 +4,7 @@ use crate::ast::nodes::{
     UpvalueIdx, VirtualId,
 };
 use crate::ast::diagnostics::Diagnostics;
-use crate::ast::types::{Identity, Purity, StaticType};
+use crate::ast::types::{Identity, NodeIdentity, Purity, RecordLayout, SourceLocation, StaticType, Value};
 use std::collections::HashMap;
 use std::rc::Rc;
 
@@ -139,7 +139,7 @@ impl Binder {
             fixed_scope_idx,
         };
         binder.functions.push(FunctionCompiler::new(
-            crate::ast::types::NodeIdentity::new(crate::ast::types::SourceLocation {
+            NodeIdentity::new(SourceLocation {
                 line: 0,
                 col: 0,
             }),
@@ -488,10 +488,10 @@ impl Binder {
                     let key_node = self.bind(k, ExprContext::Expression, diag);
                     let val_node = self.bind(v, ExprContext::Expression, diag);
 
-                    if let NodeKind::Constant(crate::ast::types::Value::Keyword(kw)) =
+                    if let NodeKind::Constant(Value::Keyword(kw)) =
                         &key_node.kind
                     {
-                        layout_fields.push((*kw, crate::ast::types::StaticType::Any));
+                        layout_fields.push((*kw, StaticType::Any));
                     } else {
                         diag.push_error(
                             format!(
@@ -504,7 +504,7 @@ impl Binder {
                     bound_fields.push((Rc::new(key_node), Rc::new(val_node)));
                 }
 
-                let layout = crate::ast::types::RecordLayout::get_or_create(layout_fields);
+                let layout = RecordLayout::get_or_create(layout_fields);
 
                 self.make_node(
                     node.identity.clone(),