【Calendar】日历组件希望可以增加一个右上角切换月份的功能区插槽，或者合并到header插槽

[yuanhongyu123]

Clear and concise description of the problem

目前右上角的功能区无法修改与调整，业务上有需求只显示当年的日历， 所以需要往前翻到1月份时禁止再往前翻页，往后翻到12月的时候也禁止再往后翻页，

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• [X] Read the Contributing Guidelines.
• [X] Read the docs.
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