Backport PostData performance fixes and new features #4314
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* Several improvements to PostData New types * `ReadOnlyMemory`, only available in `netstandard2.1` allows you to post `ReadOnlyMemory<byte>` * `StreamHandler` allows you to inject a stream handler and write to the request streams the best way you see fit yourself Performance * `PostData.String` now reuses bytes * `PostData.MultiJson(string[]) uses way less allocations * Move StreamHandler in to its own type. Expose reusable stream handling on `PostData` Add tests for new types so that they behave and write as expected * update post-data docs * Refactor SerializableData and reuse methods from PostData (cherry picked from commit af93854)
…rialize. (#4313) * Several improvements to PostData New types * `ReadOnlyMemory`, only available in `netstandard2.1` allows you to post `ReadOnlyMemory<byte>` * `StreamHandler` allows you to inject a stream handler and write to the request streams the best way you see fit yourself Performance * `PostData.String` now reuses bytes * `PostData.MultiJson(string[]) uses way less allocations * Adds more write overloads to Utf8Json Either memory stream or to serialize on the writer. This consolidates and funnels places that need to write bytes/streams/objects directly (cherry picked from commit de62914) * add missing hunk after git add -p session (cherry picked from commit fc289b1) * add comment explaining the check for possible fast path in sourceformatter (cherry picked from commit ffc4e46) * Move fastpath check into method and use it for Deserialize too (cherry picked from commit f365b30) * update formatters to use a better check for fast path (cherry picked from commit b07e0a8) * Move StreamHandler in to its own type. Expose reusable stream handling on `PostData` Add tests for new types so that they behave and write as expected * Zap IInternalSerializerWithFormatter * Make sure WriteRaw for memory streams assumes a memorycopy * Make sure final newline is written again for bulk requests * Address PR feedback * reoorder variable assignments (cherry picked from commit fadef66)
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Backport of #4313 and #4313