protobuf Implement WriteDelimitedTo(BufferWriter<byte>)

Closes #21300

I could not find tests MessageExtensions so I added a new test file.

Apr 17 '25 03:04 verdie-g

@amanda-tarafa could you have a look at this PR please 🙏

Jun 16 '25 14:06 verdie-g

Can we get this pushed further somehow? Library leaves no public surface for workaround. Forcing to write our own length when proper api is just one internal call away is unnecessarily defensive library design.

Jun 23 '25 05:06 aohotnik

@jskeet I understand you don't have much time to dedicate to protobuf these days but I'm not able to get a response on this small PR so following the Contributing Process I'd appreciate your help here 🙏

Jul 03 '25 15:07 verdie-g

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This PR is labeled inactive because the last activity was over 90 days ago. This PR will be closed and archived after 14 additional days without activity.

Oct 02 '25 10:10 github-actions[bot]

Still waiting for a reviewer.

Oct 02 '25 11:10 verdie-g

C# team is still underwater.

Oct 03 '25 20:10 googleberg

I'm sorry, but my focus is elsewhere at the moment.

Oct 03 '25 22:10 amanda-tarafa

@esrauchg anything missing to get this merged?

Nov 05 '25 20:11 verdie-g