feat(compiler): reuse the TypeScript typecheck for template typechecking. (#19152)

This speeds up the compilation process significantly.

Also introduces a new option `fullTemplateTypeCheck` to do more checks in templates:
- check expressions inside of templatized content (e.g. inside of `<div *ngIf>`).
- check the arguments of calls to the `transform` function of pipes
- check references to directives that were exposed as variables via `exportAs`
PR Close #19152

packages/compiler-cli/src/language_services.ts

@@ -15,7 +15,6 @@ to the language service.
 
 */
 export {CompilerHost, CompilerHostContext, MetadataProvider, ModuleResolutionHostAdapter, NodeCompilerHostContext} from './compiler_host';
-export {TypeChecker} from './diagnostics/check_types';
 export {DiagnosticTemplateInfo, ExpressionDiagnostic, getExpressionDiagnostics, getExpressionScope, getTemplateExpressionDiagnostics} from './diagnostics/expression_diagnostics';
 export {AstType, DiagnosticKind, ExpressionDiagnosticsContext, TypeDiagnostic} from './diagnostics/expression_type';
 export {BuiltinType, DeclarationKind, Definition, Location, PipeInfo, Pipes, Signature, Span, Symbol, SymbolDeclaration, SymbolQuery, SymbolTable} from './diagnostics/symbols';