feat(compiler): type TemplateAst values as ASTWithSource (#35892)

TemplateAst values are currently typed as the base class AST, but they
are actually constructed with ASTWithSource. Type them as such, because
ASTWithSource gives more information about the consumed expression AST
to downstream customers (namely, the expression AST source).

Unblocks #35271

PR Close #35892

packages/compiler/src/expression_parser/ast.ts

@@ -691,7 +691,7 @@ export class ParsedEvent {
   // Animation events have a phase
   constructor(
       public name: string, public targetOrPhase: string, public type: ParsedEventType,
-      public handler: AST, public sourceSpan: ParseSourceSpan,
+      public handler: ASTWithSource, public sourceSpan: ParseSourceSpan,
       public handlerSpan: ParseSourceSpan) {}
 }
 
@@ -715,6 +715,6 @@ export const enum BindingType {
 export class BoundElementProperty {
   constructor(
       public name: string, public type: BindingType, public securityContext: SecurityContext,
-      public value: AST, public unit: string|null, public sourceSpan: ParseSourceSpan,
+      public value: ASTWithSource, public unit: string|null, public sourceSpan: ParseSourceSpan,
       public valueSpan?: ParseSourceSpan) {}
 }