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/analyzer.rs

@@ -2,18 +2,18 @@ use crate::ast::nodes::{
     Address, AnalyzedNode, GlobalIdx, IdentifierBinding, Node,
     NodeKind, NodeMetrics, TypedNode, TypedPhase,
 };
-use crate::ast::types::Purity;
+use crate::ast::types::{Identity, Purity};
 use std::collections::{HashMap, HashSet};
 use std::rc::Rc;
 
 pub struct Analyzer<'a> {
     root_purity: &'a [Purity],
     /// Stack of currently visiting lambdas to detect direct recursion.
-    lambda_stack: Vec<crate::ast::types::Identity>,
+    lambda_stack: Vec<Identity>,
     /// Map of global index to its Lambda identity if known.
-    globals_to_lambdas: HashMap<GlobalIdx, crate::ast::types::Identity>,
+    globals_to_lambdas: HashMap<GlobalIdx, Identity>,
     /// Set of identities that were found to be recursive.
-    recursive_identities: HashSet<crate::ast::types::Identity>,
+    recursive_identities: HashSet<Identity>,
 }
 
 impl<'a> Analyzer<'a> {