Add field Subscription.Spec.Config.Annotations

[cognifloyd]

I need a way to annotate operator deployments to satisfy an admissions hook in my on-prem vanilla (not OCP) k8s clusters (The admissions hook requires annotations that say which team is responsible for that deployment).

After discussing in #olm-dev, it looks like Subscription is the best user (cluster admin) facing API to extend for this purpose, as other resources, like CSV, should generally be opaque to the cluster admin.

So, this PR adds an Annotations field to SubscriptionConfig (Subscription.Spec.Config.Annotations). Is there a better place for this? Or a better name?

For reference, here is a draft matching change I plan to make in the operator-lifecycle-manager repo once this PR is merged and a new api release is available:

• operator-framework/operator-lifecycle-manager@master...cognifloyd:operator-lifecycle-manager:deployment_annotations

[kevinrizza]

/lgtm
/approve

[openshift-ci]

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[codecov]

Codecov Report

Attention: 5 lines in your changes are missing coverage. Please review.

Comparison is base (75b2af0) 42.64% compared to head (915b186) 42.58%.

Files	Patch %	Lines
pkg/operators/v1alpha1/zz_generated.deepcopy.go	0.00%	5 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #312      +/-   ##
==========================================
- Coverage   42.64%   42.58%   -0.06%     
==========================================
  Files          42       42              
  Lines        3583     3588       +5     
==========================================
  Hits         1528     1528              
- Misses       1903     1908       +5     
  Partials      152      152              

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