feat: [AppsChat] Add access permission settings to Space resource for configuring space discovery and join permissions (#9337)

* feat: Add access permission settings to Space resource for configuring space discovery and join permissions
docs: Update Space reference documentation for access permission setting update masks

PiperOrigin-RevId: 945269716

Source-Link: googleapis/googleapis@98bb487

Source-Link: googleapis/googleapis-gen@9d535ed
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