lib: refactor to use optional chaining

[pd4d10]

This PR migrates expressions such as a ? a.b : c to a?.b ?? c

Codemod script: https://github.com/pd4d10/nodejs-codemod/blob/main/src/optional-chaining.ts

Also see: https://github.com/nodejs/node/issues/38609

[aduh95]

I'm not sure we want to do that after https://github.com/nodejs/node/pull/38245... In any case this should be split into several PRs, it's less of a burden to review smaller PRs and we benchmark it more efficiently.

[pd4d10]

I'm not sure we want to do that after #38245...

OK. Given this information, I guess we should hold it until the performance issues solved.

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