release bundle attribute in version property

[grokspawn]

Description of the change:
Adds a new bundle-scoped "release" flag to the existing version property to allow for more sophisticated replacement strategies with improved transparency.
Adds a new substitutesFor catalog template to help folks trivially adopt the new approaches and avoid common error scenarios.

Motivation for the change:
As brief and RFC state, the imperative upgrade graph building process had a CSV attribute "substitutesFor" which allowed tooling to perform bundle-level replacement in resulting graphs. We had no equivalent FBC approach to the problem where there is a packaging-only change which we need to insert into an existing graph in a way that it didn't pretend to be the original bundle, but made it possible to prefer the new bundle over the old one, and even upgrade from the old to the new.

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

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[openshift-ci]

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[codecov]

Codecov Report

❌ Patch coverage is 61.41304% with 71 lines in your changes missing coverage. Please review.
✅ Project coverage is 57.58%. Comparing base (24737fb) to head (63fd4b0).
⚠️ Report is 18 commits behind head on master.

Files with missing lines	Patch %	Lines
alpha/template/substitutes/substitutes.go	67.04%	23 Missing and 6 partials ⚠️
alpha/template/converter/converter.go	0.00%	12 Missing ⚠️
alpha/model/model.go	79.31%	6 Missing ⚠️
pkg/registry/csv.go	45.45%	5 Missing and 1 partial ⚠️
pkg/registry/parse.go	64.70%	3 Missing and 3 partials ⚠️
pkg/registry/bundle.go	55.55%	2 Missing and 2 partials ⚠️
pkg/lib/validation/bundle.go	0.00%	2 Missing and 1 partial ⚠️
pkg/registry/registry_to_model.go	40.00%	2 Missing and 1 partial ⚠️
alpha/declcfg/declcfg_to_model.go	75.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1792      +/-   ##
==========================================
+ Coverage   55.37%   57.58%   +2.21%     
==========================================
  Files         136      137       +1     
  Lines       16003    13105    -2898     
==========================================
- Hits         8861     7547    -1314     
+ Misses       5987     4387    -1600     
- Partials     1155     1171      +16     

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[grokspawn]

Please note that this repo's merge method is set to squash, so all of these commits will get squished to a single one even if I forget to do it manually.

They're preserved here mostly because there has been a lot of ground covered over the lifetime of this feature w.r.t. different implementation strategies, and I didn't want to lose that.

[grokspawn]

Needs to land after operator-framework/api#454 merges and a new o-f/api release is cut.
/hold

[grokspawn]

blocked by operator-framework/api#454