refactor(cdk-experimental/column-resize): switch to standalone

Reworks `cdk-experimental/column-resize` to support standalone.

Author: crisbeto

src/cdk-experimental/column-resize/column-resize-directives/column-resize-flex.ts

@@ -21,6 +21,7 @@ import {FLEX_PROVIDERS} from './constants';
 @Directive({
   selector: 'cdk-table[columnResize]',
   providers: [...FLEX_PROVIDERS, {provide: ColumnResize, useExisting: CdkColumnResizeFlex}],
+  standalone: true,
 })
 export class CdkColumnResizeFlex extends ColumnResize {
   constructor(

src/cdk-experimental/column-resize/column-resize-directives/column-resize.ts

@@ -21,6 +21,7 @@ import {TABLE_PROVIDERS} from './constants';
 @Directive({
   selector: 'table[cdk-table][columnResize]',
   providers: [...TABLE_PROVIDERS, {provide: ColumnResize, useExisting: CdkColumnResize}],
+  standalone: true,
 })
 export class CdkColumnResize extends ColumnResize {
   constructor(

src/cdk-experimental/column-resize/column-resize-directives/default-enabled-column-resize-flex.ts

@@ -24,6 +24,7 @@ import {FLEX_PROVIDERS} from './constants';
     ...FLEX_PROVIDERS,
     {provide: ColumnResize, useExisting: CdkDefaultEnabledColumnResizeFlex},
   ],
+  standalone: true,
 })
 export class CdkDefaultEnabledColumnResizeFlex extends ColumnResize {
   constructor(

src/cdk-experimental/column-resize/column-resize-directives/default-enabled-column-resize.ts

@@ -24,6 +24,7 @@ import {TABLE_PROVIDERS} from './constants';
     ...TABLE_PROVIDERS,
     {provide: ColumnResize, useExisting: CdkDefaultEnabledColumnResize},
   ],
+  standalone: true,
 })
 export class CdkDefaultEnabledColumnResize extends ColumnResize {
   constructor(

src/cdk-experimental/column-resize/column-resize-module.ts

@@ -18,7 +18,7 @@ import {CdkDefaultEnabledColumnResizeFlex} from './column-resize-directives/defa
  * When using this module, columns are resizable by default.
  */
 @NgModule({
-  declarations: [CdkDefaultEnabledColumnResize, CdkDefaultEnabledColumnResizeFlex],
+  imports: [CdkDefaultEnabledColumnResize, CdkDefaultEnabledColumnResizeFlex],
   exports: [CdkDefaultEnabledColumnResize, CdkDefaultEnabledColumnResizeFlex],
 })
 export class CdkColumnResizeDefaultEnabledModule {}
@@ -28,7 +28,7 @@ export class CdkColumnResizeDefaultEnabledModule {}
  * When using this module, columns are not resizable by default.
  */
 @NgModule({
-  declarations: [CdkColumnResize, CdkColumnResizeFlex],
+  imports: [CdkColumnResize, CdkColumnResizeFlex],
   exports: [CdkColumnResize, CdkColumnResizeFlex],
 })
 export class CdkColumnResizeModule {}