nestedKey support for chindings

[rjharmon]

nestedKey (see #759) seems useful enough in concept to warrant a specialized implementation to support it for log attributes added as part of child-logger creation.

Perhaps it could use a special string-building implementation that concatenates the stringified chindings into [nestedKey] during childLogger.<logLevel>({attrs}, ...) (something like {[nestedKey]: {...chindings, ...attrs}} would do if they were objects).

(Alternatively, it could be worth considering placing existing metadata into {meta: {...}}, such that Pino owns the object in meta:, and loggers & child-loggers can own the remainder of top-level namespace)

@matthewadams thoughts? (also: thanks!)

[Fdawgs]

@rjharmon Did you manage to resolve this?

[github-actions]

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