[CL-80] feat: indeterminate checkbox (#6357)

* add indeterminate svg

libs/components/src/checkbox/checkbox.stories.ts

@@ -110,3 +110,12 @@ export const Custom: Story = {
     `,
   }),
 };
+
+export const Indeterminate: Story = {
+  render: (args) => ({
+    props: args,
+    template: `
+      <input type="checkbox" bitCheckbox [indeterminate]="true">
+    `,
+  }),
+};