feat(component): theme support to modal

[rluders]

Breaking changes

Modal can be customized using

  modal: {
    base: string;
    show: FlowbiteBoolean;
    content: {
      base: string;
      inner: string;
    };
    body: {
      base: string;
      popup: string;
    };
    header: {
      base: string;
      popup: string;
      title: string;
      close: {
        base: string;
        icon: string;
      };
    };

closes #138

[rluders]

@tulup-conner I had to change some other components interface as well, once I included the extra types, but nothing serious. I think that we will need to clean up some things in the future, but for now, it looks fine.