[fidl][golang] Bindings support for XUnions

Details:

- xunion and nullable xunions
- partially removed support for nullable tables (FIDL-491 for remaining
work)
- all conformance tests ported (note that ordinals are different because
the library name is different, GIDL will help with that)
- splitting FIDL bindings tests out of go_stdlib_test to be able to
iterate faster (corresponding garnet change must be landed separately,
once this has been merged, and rolled into garnet)

A bit more details about testing flow

	Tab 1> fx full-build && fx serve-updates
	Tab 2> fx run -N
	Tab 3> fx run-test go_fidl_tests -- -test.v -test.run 'TestAllSuccessCases/.*xunion.*'

Test: see notes in commit message
Change-Id: Ia17c0ab3517a0ceb9480d94ad6acd62c4ae5fd16
7 files changed
tree: 465ba81b92128a71d6b6b249cea7005d5aa2cb92
  1. .github/
  2. api/
  3. doc/
  4. lib/
  5. misc/
  6. src/
  7. test/
  8. .gitattributes
  9. .gitignore
  10. AUTHORS
  11. BUILD.gn
  12. CONTRIBUTING.md
  13. CONTRIBUTORS
  14. favicon.ico
  15. LICENSE
  16. makefuchsia.go
  17. makeroot.go
  18. PATENTS
  19. README.md
  20. regen-fidl
  21. robots.txt
  22. VERSION
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