Remove glifo, vello_hybrid and vello dependencies from the workspace

[nicoburns]

A big diff, but mostly removing code, and can be reviewed commit-by-commit. I can break this up if necessary.

• The snapshot updates are mostly from the vello_cpu version bump (and are mostly non-visible changes to me)
• Some are from the glifo -> vello_cpu change.
• The scaling for emojis with skew breaks when switching from glifo -> vello_cpu, but is fixed by the vello_cpu upgrade

[nicoburns]

Hmm... tests are passing locally (on macOS!) but failing in CI (on macOS). This seems very strange to me given that we're rendering with vello_cpu...

[DJMcNab]

I'd prefer to review this as three PRs, as they can each land independently.

• Removing the drawing benchmarks and vello_hybrid_render (which I propose doing in Remove Parley's drawing benchmarks and Hybrid example #665)
• Removing the use of Glifo directly elsewhere.
• Porting the editor example to be Vello CPU only.

In particular, I think the first two will be significantly easier to review than the last, so don't want to mix in any minor review comments from them into the review of this last item.

[waywardmonkeys]

Agree on splitting this up.

[nicoburns]

I've extracted:

• Remove glifo from vello_cpu_render example #668
• Port vello_editor example to vello_cpu + rename to just editor #669

as the first steps here, in addition to Daniel's:

• Remove Parley's drawing benchmarks and Hybrid example #665

These should be simpler to review than the other changes as they don't affect the tests.

The remaining changes after those are:

• Port tests to vello_cpu glyph rendering (remove glifo)
• Upgrade vello_cpu to latest (0.0.9)

We may want to do that as one step as:

• We can't upgrade vello_cpu without first removing glifo as newer glifo won't work
• Newer vello_cpu contains fixes to glyph rendering