feat(forms): export NumberValueAccessor & RangeValueAccessor directives (#27743)

@angular/forms declares several directives and a module which are not
exported from the package via the entrypoint, either intentionally or as a
historical accident.

Ivy's locality principle necessitates that directives used in user code be
importable from the package which defines them. This requires these forms
directives to be exported.

Several directives which define ControlValueAccessors are exported:

* NumberValueAccessor
* RangeValueAccessor

A few more directives and a module are exported privately (with a ɵ prefix):

* NgNoValidate
* NgSelectMultipleOption
* InternalFormsSharedModule

PR Close #27743

tools/public_api_guard/forms/forms.d.ts

@@ -435,6 +435,16 @@ export declare class NgSelectOption implements OnDestroy {
     ngOnDestroy(): void;
 }
 
+export declare class NumberValueAccessor implements ControlValueAccessor {
+    onChange: (_: any) => void;
+    onTouched: () => void;
+    constructor(_renderer: Renderer2, _elementRef: ElementRef);
+    registerOnChange(fn: (_: number | null) => void): void;
+    registerOnTouched(fn: () => void): void;
+    setDisabledState(isDisabled: boolean): void;
+    writeValue(value: number): void;
+}
+
 export declare class PatternValidator implements Validator, OnChanges {
     pattern: string | RegExp;
     ngOnChanges(changes: SimpleChanges): void;
@@ -458,6 +468,16 @@ export declare class RadioControlValueAccessor implements ControlValueAccessor,
     writeValue(value: any): void;
 }
 
+export declare class RangeValueAccessor implements ControlValueAccessor {
+    onChange: (_: any) => void;
+    onTouched: () => void;
+    constructor(_renderer: Renderer2, _elementRef: ElementRef);
+    registerOnChange(fn: (_: number | null) => void): void;
+    registerOnTouched(fn: () => void): void;
+    setDisabledState(isDisabled: boolean): void;
+    writeValue(value: any): void;
+}
+
 export declare class ReactiveFormsModule {
     static withConfig(opts: { warnOnNgModelWithFormControl: 'never' | 'once' | 'always';
     }): ModuleWithProviders<ReactiveFormsModule>;