pass ignore_unknown_fields to nested structs

[chriselion]

Summary

Fixes #152

This passes ignore_unknown_fields to _value_from_dict(), and passes that to msg_cls.from_dict().

Note that if you're worried about this being a maintenance problem if more parameters are added to from_dict(), I think I can update it to use https://docs.python.org/3/library/typing.html#typing.Unpack to define the from_dict() args, but that might be overkill for now.

Checklist

• If code changes were made then they have been tested.
  • I have updated the documentation to reflect the changes.
• This PR fixes an issue: ignore_unknown_fields argument to Message.from_dict() is not propagated #152
• This PR adds something new (e.g. new method or parameters) - technically it's new parameters, but for internal methods.
  • This change has an associated test.
• This PR is a breaking change (e.g. methods or parameters removed/renamed)
• This PR is not a code change (e.g. documentation, README, ...)

[AdrienVannson]

Thank you for the PR!

I didn't know about Unpack, I agree it's not really needed here but it should be helpful in other parts of the code!

[nicolasalt]

Thanks for the fix! When should we expect a release containing this change? Thanks!

[chriselion]

@nicolasalt - I'm not sure what the release schedule/process is.

[AdrienVannson]

I've just released a new version, thank you!

[nicolasalt]

Thanks a lot, Adrien!