Enum not found in nested proto field

[rkrishnan2012]

In utils.rs, the find_enum_by_name and find_enum_by_name_in_message functions assume the enum is the last part of the full enum path and that the rest of the enum path is the package. It does not consider that the enum may be nested within another message. This results in the plugin searching for the enum .some.package.TestMessage.TestEnum in the "package" .some.package.TestMessage which is not actually a package, and thus it does not find it.

This is similar in effect to #30, but a little different in how the bug manifests.

[github-actions]

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