feat: [servicedirectory] added network and uid fields in Endpoint message

[sofisl]

feat: added uid field to Namespace message
feat: added uid field to Service message
feat: enable Location methods
docs: updated docs for ResolveServiceRequest message
docs: updated docs for ListServicesRequest and ListEndpointsRequest message

PiperOrigin-RevId: 549683092

Source-Link: googleapis/googleapis@c661ee0

Source-Link: https://github.com/googleapis/googleapis-gen/commit/e3c7b0298a532a7101d2ae8ec1dc0a0e2cfbb2c5
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Fixes #<issue_number_goes_here> 🦕

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