[netstack3] TCP SendBuffer in Bindings

Implement the TCP send path in Bindings and enabled the test that sends
data from ns3 and receives data from ns2.

Test: fx test -do fuchsia-pkg://fuchsia.com/netstack-integration-tests#meta/netstack-socket-integration-test.cm \
            --test-filter "tcp_socket_send_recv"
Fixed: 109349
Multiply: netstack-socket-integration-test
Change-Id: I3237156026bf1a2bc836828ef0aabd8e6dd85456
Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/723985
Fuchsia-Auto-Submit: Zeling Feng <zeling@google.com>
Reviewed-by: Jeff Martin <martinjeffrey@google.com>
Reviewed-by: Alex Konradi <akonradi@google.com>
Commit-Queue: Auto-Submit <auto-submit@fuchsia-infra.iam.gserviceaccount.com>
4 files changed
tree: aeb5b8024f9c4767115cfb8bb974ccff2f7fcd55
  1. boards/
  2. build/
  3. bundles/
  4. docs/
  5. examples/
  6. products/
  7. scripts/
  8. sdk/
  9. src/
  10. third_party/
  11. tools/
  12. zircon/
  13. .clang-format
  14. .clang-tidy
  15. .editorconfig
  16. .git-blame-ignore-revs
  17. .gitattributes
  18. .gitignore
  19. .gn
  20. .style.yapf
  21. analysis_options.yaml
  22. AUTHORS
  23. BUILD.gn
  24. CODE_OF_CONDUCT.md
  25. CONTRIBUTING.md
  26. LICENSE
  27. OWNERS
  28. PATENTS
  29. pyrightconfig.json
  30. README.md
  31. rustfmt.toml
README.md

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