Update OpenAPI spec to 2 Oct 2023 (#373)

## Changes
This PR updates the OpenAPI spec for Databricks SDK for Python. The main
noteworthy changes are:
1. Changing the deserialization pathway for paginated, non-multi-request
APIs (i.e., APIs that return an object containing an array of all listed
values). Now, we will use the `from_dict` method for the Response class
and return the named result field. "Multi-request" APIs are not changed
(they still use a generator and fetch new pages incrementally on
demand), and list APIs that return an array directly are not handled by
the `method-call-paginated` template.

## Tests
Reran all integration tests.
Manually ran some code exercising the updated pathways, such as:
```
a.metastore_assignments.list(y.metastore_assignment.metastore_id)
```

Author: mgyucht

.codegen/_openapi_sha

@@ -1 +1 @@
-b52a3b410976501f08f76ca0b355fb2dca876953
+bcbf6e851e3d82fd910940910dd31c10c059746c

.codegen/service.py.tmpl

@@ -275,7 +275,8 @@ class {{.Name}}API:{{if .Description}}
           {{- end}}
         {{else -}}
         json = {{template "method-do" .}}
-        return [{{.Pagination.Entity.PascalName}}.from_dict(v) for v in json{{if .Pagination.Results}}.get('{{.Pagination.Results.Name}}', []){{end}}]
+        parsed = {{.Response.PascalName}}.from_dict(json).{{.Pagination.Results.SnakeName}}
+        return parsed if parsed is not None else []
         {{end}}
 {{- end}}
 
@@ -312,7 +313,7 @@ self._api.do('{{.Verb}}',
   {{- else if .Response}} -> {{if .Response.ArrayValue -}}
     Iterator[{{template "type" .Response.ArrayValue}}]
   {{- else if .Pagination -}}
-    Iterator[{{.Pagination.Entity.PascalName}}]
+    Iterator[{{template "type" .Pagination.Entity}}]
   {{- else -}}
     {{- if .Response.IsExternal -}}
       {{.Response.Package.Name}}.{{.Response.PascalName}}
@@ -321,4 +322,3 @@ self._api.do('{{.Verb}}',
     {{- end -}}
   {{- end}}{{end}}
 {{- end}}
-