feat: support alternative container via as prop

[amoshydra]

Summary

Provide a new prop as allowing container to be switched out to a user provided React.ElementType or React.ComponentType

Related to

Related to #110

How is this tested?

Tested with the following code snippet (This is not included in this PR / documentation change)

import React from "react";
import Lottie from "../../../src/components/Lottie";
import groovyWalkAnimation from "../../assets/groovyWalk.json";

const LottieAsExample = () => {
  return (
    <button>
      <Lottie
        animationData={groovyWalkAnimation}
        autoplay={true}
        as="span"
        style={{ display: 'inline-block', width: "2rem" }}
        data-testid="loading-graphic"
      />
      Loading
    </button>
  );
};

export default LottieAsExample;