feat: add Schedule to SubscriptionSpec

[Abirdcfly]

Signed-off-by: Abirdcfly fp544037857@gmail.com

[codecov[bot]]

Codecov Report

Merging #268 (6b63f1e) into main (31b77e1) will increase coverage by 0.64%. The diff coverage is 40.86%.

@@            Coverage Diff             @@
##             main     #268      +/-   ##
==========================================
+ Coverage   16.96%   17.61%   +0.64%     
==========================================
  Files          34       34              
  Lines        3359     3452      +93     
==========================================
+ Hits          570      608      +38     
- Misses       2756     2811      +55     
  Partials       33       33              

Files Changed	Coverage Δ
api/v1alpha1/subscription_types.go	100.00% <ø> (ø)
api/v1alpha1/subscription_webhook.go	6.12% <0.00%> (-1.78%)	:arrow_down:
api/v1alpha1/webhook.go	0.00% <ø> (ø)
controllers/subscription_controller.go	0.00% <0.00%> (ø)
api/v1alpha1/subscription.go	89.85% <100.00%> (+12.43%)	:arrow_up:

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[Abirdcfly]

test failed reported by #274, maybe fixed by #279