chore: update Release-As version to 1.0.0 (#674)

Issue #, if available: N/A

It's been a year since Finch was originally released as a pre-1.0 (i.e.
"unstable") project. Since then, the project has made a number of
improvements to usability, compatibility, and feature-completeness. In
addition to the more visible changes, there is also a suite of
benchmarks and comprehensive e2e and unit tests which are executed on
every single PR/commit. Through 13 releases, Finch has only had [one
unanticipated breaking
change](https://github.com/runfinch/finch/releases/tag/v0.3.0), as the
result of a bug with the initial implementation of persistent disks (and
even then, there was a migration path for users that may have been
impacted).

Other changes that would have been breaking (e.g.
#637 (comment)) have
been caught by our e2e tests and reported/fixed upstream (many times
with the fix proposed/implemented by Finch maintainers), instead of
impacting Finch users. Because of all of this work, I believe that Finch
is now ready to operate as stable software.

*Description of changes:*
- Set next release to v1.0.0

*Testing done:*


- [x] I've reviewed the guidance in CONTRIBUTING.md


#### License Acceptance

By submitting this pull request, I confirm that my contribution is made
under the terms of the Apache 2.0 license.

Signed-off-by: Justin Alvarez <[email protected]>