[FEATURE] add spotify shortcode support

[Kindle-deep]

Describe the feature you want 描述你的功能需求

spotify分享shortcode

Useful reference 有价值的参考

`{{- if .IsNamedParams -}}

<iframe src="https://open.spotify.com/embed/{{ .Get "type" }}/{{ .Get "id" }}" width="{{ default "100%" (.Get "width") }}" height="{{ default "380" (.Get "height") }}" frameborder="0" allowtransparency="true" allow="encrypted-media"></iframe> {{- else -}} <iframe src="https://open.spotify.com/embed/{{ .Get 0 }}/{{ .Get 1 }}" width="{{ default "100%" (.Get 2) }}" height="{{ default "380" (.Get 3) }}" frameborder="0" allowtransparency="true" allow="encrypted-media"></iframe> {{- end -}} `

type（必选项）： album,trick,playlist,artist
id（必选项）：分享链接中获取
height：（非必选）
weight：（非必选）

示例：
{{< spotify type="artist" id="74ASZWbe4lXaubB36ztrGX" >}}

[Lruihao]

sppported Extended Shortcode - Spotify