feat(alloydb): support for obtaining the public IP address of an Inst…

…ance (#9470)

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feat: support for getting PSC DNS name from the GetConnectionInfo API

PiperOrigin-RevId: 610415824

Source-Link: https://togithub.com/googleapis/googleapis/commit/0733fdb5f745192f9f3c95f8d08039286567cbcc

Source-Link: https://togithub.com/googleapis/googleapis-gen/commit/49fd8e089feda5d293d18802548db52c3fbfb70c
Copy-Tag: eyJwIjoiLmdpdGh1Yi8uT3dsQm90LnlhbWwiLCJoIjoiNDlmZDhlMDg5ZmVkYTVkMjkzZDE4ODAyNTQ4ZGI1MmMzZmJmYjcwYyJ9