[bt] Support write long char/desc values

BT-318 #done

Testing:
bt-host-unittests : Added unit tests for the gatt client methods and
added unit tests for the higher level service logic as well.
Tested an actual long write to a device - device seemed to accept it.
Tested with long writes in PTS! Verified that we sent prepare writes and
followed with execute write as expected.

Change-Id: I4b66efc0ef862ea0d671298bc0dcd5cbe14a9ce7
26 files changed
tree: 00f9c3578cb32c719ba59c7f5420bf1ef5a68a55
  1. boards/
  2. build/
  3. buildtools/
  4. bundles/
  5. docs/
  6. examples/
  7. garnet/
  8. peridot/
  9. products/
  10. scripts/
  11. sdk/
  12. src/
  13. third_party/
  14. tools/
  15. zircon/
  16. .clang-format
  17. .clang-tidy
  18. .dir-locals.el
  19. .gitattributes
  20. .gitignore
  21. .gn
  22. AUTHORS
  23. BUILD.gn
  24. CODE_OF_CONDUCT.md
  25. CONTRIBUTING.md
  26. LICENSE
  27. OWNERS
  28. PATENTS
  29. README.md
  30. rustfmt.toml
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