feat: add import keyword enum to schematics

npm/ng-packs/packages/schematics/src/enums/import-keyword.ts

@@ -0,0 +1,4 @@
+export enum eImportKeyword {
+  Default = 'import',
+  Type = 'import type',
+}

npm/ng-packs/packages/schematics/src/enums/index.ts

@@ -1,2 +1,3 @@
 export * from './binding-source-id';
 export * from './exception';
+export * from './import-keyword';