perf: cache Resource.CurId & PrevIds return value

[ephesused]

Cache the return value for both Resource.CurId and Resource.PrevIds to improve overall performance. These changes have minor effects on small kustomize runs, but can provide significant benefits for larger runs.

Edited to add: This work significantly helps #5084 (comment).

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[ephesused]

Highlighting a few comments from what I wrote over in #5084 (comment):

... do you know if there are reasons why caching Resource.CurId() could be problematic? I feel like there may be hidden pitfalls here. Is this sort of caching in line with kustomize coding patterns? In addition to resWrangler.appendReplaceOrMerge, are there other spots that might adjust a resource in a way that could alter its ResId, but do not issue a call to Resource.setPreviousId()? Anything other aspect I might be missing?

[ephesused]

Test results from my runs show meaningful improvements where I expected, with identical kustomize output between the PR and v5.3.0.

A testcase based on #2869:

kustomize_test.go:289: Runtime variation (0.56x): branch-pr-5481 ran in 433ms; release-v5.3.0 ran in 769ms.

Moderately sized content with somewhat complex kustomizations:

 kustomize_test.go:289: Runtime variation (0.85x): branch-pr-5481 ran in 16043ms; release-v5.3.0 ran in 18772ms.

Large content with complex kustomizations:

kustomize_test.go:289: Runtime variation (0.72x): branch-pr-5481 ran in 144304ms; release-v5.3.0 ran in 200504ms.

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/lifecycle stale

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/lifecycle rotten

[ephesused]

I'd like this to be considered.

/remove-lifecycle rotten