Integrate QCS API client

[erichulburd]

Relates to issue #1298

High-level changes:

• Replaced PyquilConfig with QCSClientConfiguration. This deprecated all the old env vars, like QVM_URL and QUILC_URL, which are now:
  • QCS_SETTINGS_APPLICATIONS_PYQUIL_QVM_URL
  • QCS_SETTINGS_APPLICATIONS_PYQUIL_QUILC_URL
• Network calls (including auth/engagements) are all handled by a new class api.Client*
• Common QVMCompiler and QPUCompiler code moved into existing AbstractCompiler base
• QVMCompiler now produces a Program instead of PyQuilExecutableResponse. This means that QVM.load() always takes a Program instead of something "compiled" (QVM.requires_executable was also removed as it is moot)
• Removed deprecated error types (api/_errors.py)
• Other small refactors and error message cleanup

• Note: We've decided that in a later PR, we'll refactor the api.Client to be more of a client factory, rather than have it be a do-all client

[notmgsk]

When you say some envvars have been deprecated, does that mean they will still continue to work (and potentially emit a warning)?

[ameyer-rigetti]

When you say some envvars have been deprecated, does that mean they will still continue to work (and potentially emit a warning)?

@notmgsk "Deprecated" may have been a poor word choice. They will not longer function and will require the noted prefix.

The changelog words it better.

[notmgsk]

When you say some envvars have been deprecated, does that mean they will still continue to work (and potentially emit a warning)?

@notmgsk "Deprecated" may have been a poor word choice. They will not longer function and will require the noted prefix.

Cool. We should make a note of this in any migration documentation.

[ameyer-rigetti]

Cool. We should make a note of this in any migration documentation.

@notmgsk Definitely. Updating docs is in the epic :)

[notmgsk]

Progress!1!

[notmgsk]

Maybe note what the criteria are

[ameyer-rigetti]

I should have mentioned: this and the two functions around it were simply moved over from _base _connection.py, so I don't know a ton about their implementation

[rigetti-githubbot]

🎉 This PR is included in version 3.0.0-rc.1 🎉

The release is available on GitHub release

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