bundle version increased type safety / serialization support

[grokspawn]

Description of the change:
This is a deliberate re-scoping of the CompositeVersion type to co-locate all the bits of dependency on use of the underlying blang semver PRVersion slice, by making this an explicit type.
The original implementation was evaluating the tradeoffs between re-use of the semver.Parse method versus re-implementing just the semver.org pre-release version info for validation.

api-diff is intended to fail here, and will need to be overridden (since we are un-exporting the fields to make this an opaque type).

Motivation for the change:

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

[openshift-ci]

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[codecov]

Codecov Report

❌ Patch coverage is 96.77419% with 1 line in your changes missing coverage. Please review.
✅ Project coverage is 57.74%. Comparing base (6ea0f39) to head (ef468c4).
⚠️ Report is 4 commits behind head on master.

Files with missing lines	Patch %	Lines
alpha/declcfg/declcfg.go	96.77%	0 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1938      +/-   ##
==========================================
+ Coverage   57.50%   57.74%   +0.24%     
==========================================
  Files         139      139              
  Lines       13339    13382      +43     
==========================================
+ Hits         7671     7728      +57     
+ Misses       4486     4468      -18     
- Partials     1182     1186       +4     

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[tmshort]

Is there a value we can get that isn't a magic number?

[grokspawn]

There isn't one defined presently, but I'm happy to define a constant here for it. The reference is in the type here, but we're deliberately not using that type in this repo (to de-couple v0 & v1 uses), so we just need to be consistent.

[tmshort]

/approve

[openshift-ci]

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This pull-request has been approved by: tmshort

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