This rolls to CIPD package versions:
macOS SDK: pWygawI3vBzP9dYloEvKka8r1p0NpLLZzZQ-yMYI1UIC
Linux SDK: L_ORUWXyDEC29pSiSyKIwGqcFMQFsV91E3h_wPbUIUkC
Applies two breaking changes from the SDK:
* `zx_clock_get_new()` has been eliminated and replaced with
`zx_clock_get()`. See:
https://fuchsia-review.googlesource.com/c/fuchsia/+/293688
* Scenic `Metrics` no longer supports operator==; instead we use
`fidl::Equals()`.
Corects a bnuch of typeos throughout teh engien codebsae. Also makes
a couple minor Commonwealth -> US spelling adjustments for consistency
with the rest of Flutter's codebase.
Made use of `misspell` tool:
https://github.com/client9/misspell
