feat(execution): Support maxEnqueuedJobs

[irvinlim]

Closes #15.

Adds a new config field maxEnqueuedJobs, which defines the global maximum of enqueued jobs that can be created per JobConfig.

[codecov]

Codecov Report

Merging #43 (b397309) into main (5245548) will decrease coverage by 0.44%.
The diff coverage is 29.35%.

@@            Coverage Diff             @@
##             main      #43      +/-   ##
==========================================
- Coverage   51.89%   51.45%   -0.45%     
==========================================
  Files         162      163       +1     
  Lines        8024     8095      +71     
==========================================
+ Hits         4164     4165       +1     
- Misses       3664     3731      +67     
- Partials      196      199       +3     

Impacted Files	Coverage Δ
apis/config/v1alpha1/dynamicconfig_types.go	100.00% <ø> (ø)
apis/config/v1alpha1/zz_generated.deepcopy.go	0.00% <0.00%> (ø)
...execution/controllers/croncontroller/controller.go	25.00% <0.00%> (+1.31%)	⬆️
...g/execution/controllers/croncontroller/recorder.go	0.00% <0.00%> (ø)
pkg/execution/mutation/mutation.go	84.37% <0.00%> (-0.45%)	⬇️
pkg/runtime/controllercontext/context_configs.go	18.64% <33.33%> (+2.64%)	⬆️
pkg/execution/validation/validation.go	91.95% <73.68%> (-1.47%)	⬇️
...execution/controllers/croncontroller/reconciler.go	81.70% <76.92%> (-5.64%)	⬇️
...kg/execution/controllers/croncontroller/control.go	100.00% <100.00%> (ø)
pkg/runtime/configloader/defaults_loader.go	63.15% <100.00%> (+0.99%)	⬆️
... and 2 more

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