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config: evaluate instance configs lazily

Before this patch tarantool evaluates instance configurations for all
the cluster members on startup (and on configuration reload). It takes
observable amount of time for large clusters (500 instances or more),
while these configurations are not necessarily accessed by a user.

This patch adds a simple machinery to evaluate them lazily, when
accessed (for example, by `config:get(<...>, {instance = <...>})`).

Timings of startup of a single instance from a configuration with 9000
instances on my laptop: 21 seconds before the patch, 0.6 seconds
afterwards.

Fixes TNTP-4284

NO_DOC=no API changes

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