WIP: Add 'index graph' subcommand for graphviz output

[joelanford]

Description of the change:

This PR is a port of https://github.com/joelanford/olm-index-graph as a new opm index graph subcommand.

Motivation for the change:

As an operator author, I need tooling for visualizing the upgrade graph+channels (and across indexes) to determine that I’ve gotten my upgrade path correct.

Reviewer Checklist

• [ ] Implementation matches the proposed design, or proposal is updated to match implementation
• [ ] Sufficient unit test coverage
• [ ] Sufficient end-to-end test coverage
• [ ] Docs updated or added to /docs
• [ ] Commit messages sensible and descriptive

TODO

• [ ] Re-use and/or re-purpose Package instead of introducing GraphPackage?
• [ ] Introduce Package interface. Suggestions on what interface methods should exist?
• [ ] Support for graphing multiple indices?
• [ ] Remove support for building graph directly from database file provided on command line?
• [ ] Add tests
• [ ] Add docs

Any other feedback?

[openshift-merge-robot]

@joelanford: The following test failed, say /retest to rerun all failed tests:

Test name	Commit	Details	Rerun command
ci/prow/e2e-aws	fc114e7174bd14ea527725bbbffa6820c9e5515d	link	/test e2e-aws

Full PR test history. Your PR dashboard.

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[joelanford]

To test this out:

make bin/opm
./bin/opm index graph quay.io/operator-framework/upstream-community-operators:latest -o upstream-community-operators.db.dot
dot upstream-community-operators.db.dot -Tsvg -o upstream-community-operators.db.svg
firefox upstream-community-operators.db.svg

[openshift-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: ecordell, joelanford

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• ~~OWNERS~~ [ecordell]

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[openshift-ci-robot]

@joelanford: PR needs rebase.

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[anik120]

@joelanford I'm guessing you're not working on this actively now. Closing this to reduce PR review request noise.