DO NOT MERGE: add span_based_serialization design#6874

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jtattermusch wants to merge 6 commits intoprotocolbuffers:masterfrom jtattermusch:csharp_design_span_based_serialization

+114

Commits on Nov 12, 2019

add span_based_serialization design
jtattermusch
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Commits on Nov 19, 2019

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jtattermusch
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JamesNK
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Commits on Jan 6, 2020

Commits on Jan 7, 2020