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lib: make navigator properties lazy

Rodrigo Muino Tomonari requested to merge github/fork/jasnell/make-navigator-properties-lazy into main

Noticed in some benchmarking/profiling that the Navigator object constructor was rather expensive and slow due to initialization of properties during construction. It makes more sense for these to be lazily initialized on first access.

Flamegraphs... of `node -pe "navigator"

Before: image

After: image

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