fix(49306): add isImportTypeAssertionContainer helper

Author: a-tarasyuk

Diff for: src/compiler/factory/nodeTests.ts

@@ -597,6 +597,10 @@ namespace ts {
         return node.kind === SyntaxKind.ImportClause;
     }
 
+    export function isImportTypeAssertionContainer(node: Node): node is ImportTypeAssertionContainer {
+        return node.kind === SyntaxKind.ImportTypeAssertionContainer;
+    }
+
     export function isAssertClause(node: Node): node is AssertClause {
         return node.kind === SyntaxKind.AssertClause;
     }

Diff for: tests/baselines/reference/api/tsserverlibrary.d.ts

@@ -4724,6 +4724,7 @@ declare namespace ts {
     function isImportEqualsDeclaration(node: Node): node is ImportEqualsDeclaration;
     function isImportDeclaration(node: Node): node is ImportDeclaration;
     function isImportClause(node: Node): node is ImportClause;
+    function isImportTypeAssertionContainer(node: Node): node is ImportTypeAssertionContainer;
     function isAssertClause(node: Node): node is AssertClause;
     function isAssertEntry(node: Node): node is AssertEntry;
     function isNamespaceImport(node: Node): node is NamespaceImport;

Diff for: tests/baselines/reference/api/typescript.d.ts

@@ -4724,6 +4724,7 @@ declare namespace ts {
     function isImportEqualsDeclaration(node: Node): node is ImportEqualsDeclaration;
     function isImportDeclaration(node: Node): node is ImportDeclaration;
     function isImportClause(node: Node): node is ImportClause;
+    function isImportTypeAssertionContainer(node: Node): node is ImportTypeAssertionContainer;
     function isAssertClause(node: Node): node is AssertClause;
     function isAssertEntry(node: Node): node is AssertEntry;
     function isNamespaceImport(node: Node): node is NamespaceImport;