fix: support pydantic-version google pb (#568)

* feat: pydantic version of google pb

* fix: patch pb Struct to support json, dict rountrip

* fix: pydantic-version google pb, json, dict rntrip

* chore: remove `@generated`, remove gen, code fmt

* chore: test case for pydantic-version google pb

pyproject.toml

@@ -95,11 +95,11 @@ cmd = """
 protoc
     --plugin=protoc-gen-custom=src/betterproto/plugin/main.py
     --custom_opt=INCLUDE_GOOGLE
-    --custom_out=src/betterproto/lib
+    --custom_out=src/betterproto/lib/std
     -I /usr/local/include/
     /usr/local/include/google/protobuf/**/*.proto
 """
-help = "Regenerate the types in betterproto.lib.google"
+help = "Regenerate the types in betterproto.lib.std.google"
 
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