Add new completion models (aws#10030)

Author: Songblade

.changes/next-release/enhancement-Autocomplete-89913.json

@@ -0,0 +1,5 @@
+{
+  "type": "enhancement",
+  "category": "Autocomplete",
+  "description": "Added completers for account, amp, apigatewayv2, s3, s3tables"
+}

awscli/botocore/data/account/2021-02-01/completions-1.json

@@ -0,0 +1,46 @@
+{
+  "version": "1.0",
+  "resources": {
+    "Region": {
+      "operation": "ListRegions",
+      "resourceIdentifier": {
+        "RegionName": "Regions[].RegionName"
+      }
+    }
+  },
+  "operations": {
+    "DisableRegion": {
+      "RegionName": {
+        "completions": [
+          {
+            "parameters": {},
+            "resourceName": "Region",
+            "resourceIdentifier": "RegionName"
+          }
+        ]
+      }
+    },
+    "EnableRegion": {
+      "RegionName": {
+        "completions": [
+          {
+            "parameters": {},
+            "resourceName": "Region",
+            "resourceIdentifier": "RegionName"
+          }
+        ]
+      }
+    },
+    "GetRegionOptStatus": {
+      "RegionName": {
+        "completions": [
+          {
+            "parameters": {},
+            "resourceName": "Region",
+            "resourceIdentifier": "RegionName"
+          }
+        ]
+      }
+    }
+  }
+}