static getFullTypeWithAllCodecs(mimeType, codecs) {
    let fullMimeType = mimeType;
    if (codecs) {
      fullMimeType += '; codecs="' + codecs + '"';
    }
    return fullMimeType;
  }
Takes a MIME type and optional codecs string and produces the full MIME
type.

@param {string} mimeType
@param {string=} codecs
@return {string}
@export