[WIP] feat: support multi secret namespace watch

[YoniRomm]

Changes

Created a factory that wraps multiple informers when there is a need to watch multiple specific namespaces, overcoming the core Go library limitation which only allows an informer to watch either cluster-wide or a single namespace.

• 🎁 Add new feature

/kind enhancement

Fixes #3367

Release Note

Added a multi-namespace informer factory to support watching multiple specific namespaces simultaneously.

[knative-prow]

@YoniRomm: The label(s) kind/<kind> cannot be applied, because the repository doesn't have them.

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In response to this:

Changes

create factory that warps multiple informers when needs to watach multiple namespaces as the core go library only allows
for an informer to watch cluster wide or 1 namespace only

/kind

Fixes #

Release Note

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[knative-prow]

Welcome @YoniRomm! It looks like this is your first PR to knative/pkg 🎉

[knative-prow]

Hi @YoniRomm. Thanks for your PR.

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[YoniRomm]

/issue 3367