Expose vSphere API to evict subscribed content library

[acharyasreej]

Is your feature request related to a problem? Please describe.
I want to invoke the CLS evict subscribed library API https://developer.vmware.com/apis/vsphere-automation/latest/content/api/content/subscribed-library/library_idactionevict/post/ but govmomi does not expose the required vSphere API.

Describe the solution you'd like
Would like to expose the vSphere API to evict the subscribed content library to free up storage capacity.
The vSphere API evicts the cached content of an on-demand subscribed library. This operation allows the cached content of a subscribed library to be removed to free up storage capacity. This operation will only work when a subscribed library is synchronized on-demand.

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