Add bundle size validation

[bentito]

Initial take on adding a validation of the bundle size. Please let me know how it is wrong ;-)

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[camilamacedo86]

Would that be possible?

• We have an attr https://github.com/operator-framework/api/blob/master/pkg/manifests/bundleloader.go#L20 for the size?
• when we load we set the size
• Is the size criteria for ANY bundle built? Is that a limitation for OLM no matter o what? If yes, wdyt about we check it in the BundleValidator https://github.com/operator-framework/api/blob/master/pkg/validation/internal/bundle.go#L28

Also, note that we need to cover the implementations with unit tests as it is done in _test.go files to ensure the checks.

[camilamacedo86]

The bundle is load here:

api/pkg/manifests/bundleloader.go

Lines 32 to 46 in b512869

	func (b *bundleLoader) LoadBundle() error {
	errs := make([]error, 0)
	if err := filepath.Walk(b.dir, collectWalkErrs(b.LoadBundleWalkFunc, &errs)); err != nil {
	errs = append(errs, err)
	}
	if !b.foundCSV {
	errs = append(errs, fmt.Errorf("unable to find a csv in bundle directory %s", b.dir))
	} else if b.bundle == nil {
	errs = append(errs, fmt.Errorf("unable to load bundle from directory %s", b.dir))
	}
	return utilerrors.NewAggregate(errs)
	}

we can get the size there (ihmo). i do not think we canbundleDir := "."