Add lineSeparatorRootWrapper property to CommonStyleType

This commit introduces a new optional property, `lineSeparatorRootWrapper`, to the `CommonStyleType` interface. This property allows for the customization of the root wrapper style for line separators, providing more flexibility in the styling of these elements.

Author: Hector Arce De Las Heras

src/components/lineSeparator/types/lineSeparatorTheme.ts

@@ -20,6 +20,7 @@ export enum LineSeparatorPositionType {
 
 export type LineSeparatorLinePropsStylesType = {
   buildLineStyles?: (position?: LineSeparatorPositionType) => CSSProp;
+  lineSeparatorRootWrapper?: CommonStyleType;
 };
 
 export type LineSeparatorLineStylesType<P extends string | number | symbol> = {