Generate Quantity helper methods for dies

[scothis]

Dies that have fields of resource.Quantity or corev1.ResourceList often have setter methods to parse a string formatted quantity into the structured value. Rather than the user defining these values, we can generate them when we see a field of the type.

for resource.Quantity:

func (d *MyResourceDie) CapacityString(quantity string) *MyResourceDie {
	q := resource.MustParse(quantity)
	return d.Capacity(q)
}

for corev1.ResourceList:

func (d *MyResourceDie) AddLimit(name corev1.ResourceName, quantity resource.Quantity) *MyResourceDie {
	return d.DieStamp(func(r *corev1.ResourceQuotaSpec) {
		if r.Limits == nil {
			r.Limits = corev1.ResourceList{}
		}
		r.Limits[name] = quantity
	})
}

func (d *MyResourceDie) AddLimitString(name corev1.ResourceName, quantity string) *MyResourceDie {
    q := resource.MustParse(quantity)
	return d.AddLimit(name, q)
}

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 9.71%. Comparing base (9bf2706) to head (f3a783e).

Additional details and impacted files

@@           Coverage Diff            @@
##            main    #148      +/-   ##
========================================
+ Coverage   9.24%   9.71%   +0.47%     
========================================
  Files         69      69              
  Lines       3385    3221     -164     
========================================
  Hits         313     313              
+ Misses      3069    2905     -164     
  Partials       3       3              

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