Add builder parameter to BeamerLocationBuilder

[AlaaEldeenYsr]

I need to use builder parameter with BeamerLocationBuilder like RoutesBeamLocation and RouterLocationBuilder

BeamerLocationBuilder(
  // builder missing
  beamLocations: beamLocations,
);

RoutesBeamLocation(
  // builder
  navBuilder: (context, navigator) => builder(navigator),
  routeInformation: routeInformation,
  routes: routes,
);

  RoutesLocationBuilder(
  // builder
  builder: (context, navigator) => builder(navigator),
  routes: routes,
);

[slovnicki]

Hey @AlaaEldeenYsr :wave: Thanks for creating an issue and sorry for my absence lately.

As BeamerLocationBuilder accepts multiple BeamLocations, we have the builder to override on each of them, as needed; https://github.com/slovnicki/beamer/blob/a16123a859907b00b3cf2a2c8ae0372a76cd16e5/package/lib/src/beam_location.dart#L340