Add stream file transfer

[nginx-nickc]

Proposed changes

Added stream data transfer for handle large files. General idea is to add *Stream rpc for existing GetFile and UpdateFile, where the file content is divided into chunks. MP and agent can agree on a size limit to use this stream transfer mechanism. Smaller files may not make sense for this.

Added SendChunkedFile and RecvChunkedFile as implementation.

Checklist

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• I have read the CONTRIBUTING document
• I have run make install-tools and have attached any dependency changes to this pull request
• If applicable, I have added tests that prove my fix is effective or that my feature works
• If applicable, I have checked that any relevant tests pass after adding my changes
• If applicable, I have updated any relevant documentation (README.md)
• If applicable, I have tested my cross-platform changes on Ubuntu 22, Redhat 8, SUSE 15 and FreeBSD 13

[github-actions]

✅ All required contributors have signed the F5 CLA for this PR. Thank you!
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[nginx-nickc]

I have hereby read the F5 CLA and agree to its terms

[dhurley]

looks good. Just have some minor comments around the error messages