feat: add 3speak embedder

I add 3speak embedder with tests, please be aware that you need to style it on the frontend project. Example

.threeSpeakWrapper,
            .twitterWrapper,
            .videoWrapper {
                position: relative;
                width: 100%;
                height: 0;
                padding-bottom: 56.25%;
            }

            iframe {
                position: absolute;
                left: 0;
                top: 0;
                width: 100%;
                height: 100%;
            }