feat(datacatalog/lineage): add open lineage support (#8974)

- [ ] Regenerate this pull request now.

fix: change `start_time` in message `.google.cloud.datacatalog.lineage.v1.LineageEvent` to `required` as intended by api
PiperOrigin-RevId: 579762272

Source-Link: https://togithub.com/googleapis/googleapis/commit/58878bdf14a716bcbe909c6f987a6b7bd42879d9

Source-Link: https://togithub.com/googleapis/googleapis-gen/commit/96a4d735b92f202fbdd2c62da2e21e63216bfa88
Copy-Tag: eyJwIjoiLmdpdGh1Yi8uT3dsQm90LnlhbWwiLCJoIjoiOTZhNGQ3MzViOTJmMjAyZmJkZDJjNjJkYTJlMjFlNjMyMTZiZmE4OCJ9
BEGIN_NESTED_COMMIT
feat(aiplatform): add Optimized to FeatureOnlineStore
PiperOrigin-RevId: 579291287

Source-Link: https://togithub.com/googleapis/googleapis/commit/90a53d6d1c1c1854e73f390a7701069dc6da8146

Source-Link: https://togithub.com/googleapis/googleapis-gen/commit/94f8d8b2207ecf9882a88c305590bcea9ec01d6e
Copy-Tag: eyJwIjoiLmdpdGh1Yi8uT3dsQm90LnlhbWwiLCJoIjoiOTRmOGQ4YjIyMDdlY2Y5ODgyYTg4YzMwNTU5MGJjZWE5ZWMwMWQ2ZSJ9
END_NESTED_COMMIT

datacatalog/lineage/apiv1/gapic_metadata.json

@@ -95,6 +95,11 @@
                 "ListRuns"
               ]
             },
+            "ProcessOpenLineageRunEvent": {
+              "methods": [
+                "ProcessOpenLineageRunEvent"
+              ]
+            },
             "SearchLinks": {
               "methods": [
                 "SearchLinks"
@@ -200,6 +205,11 @@
                 "ListRuns"
               ]
             },
+            "ProcessOpenLineageRunEvent": {
+              "methods": [
+                "ProcessOpenLineageRunEvent"
+              ]
+            },
             "SearchLinks": {
               "methods": [
                 "SearchLinks"