feat(documentai): add model_type in v1beta3 processor proto (#9355)

- [ ] Regenerate this pull request now.

PiperOrigin-RevId: 603726122

Source-Link: https://togithub.com/googleapis/googleapis/commit/c7fd8bd652ac690ca84f485014f70b52eef7cb9e

Source-Link: https://togithub.com/googleapis/googleapis-gen/commit/23bc05e699ad5701027589137be44d4a43091829
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BEGIN_NESTED_COMMIT
chore(apps/meet): update go_package and Go importpath
PiperOrigin-RevId: 603489497

Source-Link: https://togithub.com/googleapis/googleapis/commit/5335f41fadc7d784cdf91f0bbf595475f36b4074

Source-Link: https://togithub.com/googleapis/googleapis-gen/commit/f73599d0f6e124eb851f1c5ec065b21d59362201
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END_NESTED_COMMIT
BEGIN_NESTED_COMMIT
feat(aiplatform): Add generateContent Unary API for aiplatform_v1
docs: Update comment for DirectPredict and DirectRawPredict

PiperOrigin-RevId: 603498510

Source-Link: https://togithub.com/googleapis/googleapis/commit/49815f4d9ce5603b56207018e44255599ae68bd9

Source-Link: https://togithub.com/googleapis/googleapis-gen/commit/893e2e072e7aa54f3fb0425a3c2da9a2668c701b
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END_NESTED_COMMIT
BEGIN_NESTED_COMMIT
feat(aiplatform): Add generateContent Unary API for aiplatform_v1beta1
docs: Update comment for DirectPredict and DirectRawPredict

PiperOrigin-RevId: 603497761

Source-Link: https://togithub.com/googleapis/googleapis/commit/4f5f442a1b0eea843ebd179f2b4673ae67332ed9

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END_NESTED_COMMIT

aiplatform/apiv1/gapic_metadata.json

@@ -2077,6 +2077,11 @@
                 "Explain"
               ]
             },
+            "GenerateContent": {
+              "methods": [
+                "GenerateContent"
+              ]
+            },
             "GetIamPolicy": {
               "methods": [
                 "GetIamPolicy"
@@ -2122,11 +2127,26 @@
                 "SetIamPolicy"
               ]
             },
+            "StreamDirectPredict": {
+              "methods": [
+                "StreamDirectPredict"
+              ]
+            },
+            "StreamDirectRawPredict": {
+              "methods": [
+                "StreamDirectRawPredict"
+              ]
+            },
             "StreamGenerateContent": {
               "methods": [
                 "StreamGenerateContent"
               ]
             },
+            "StreamRawPredict": {
+              "methods": [
+                "StreamRawPredict"
+              ]
+            },
             "StreamingPredict": {
               "methods": [
                 "StreamingPredict"