tarantool / tarantool / 28878607305

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config: add readiness health checks

This patch adds readiness checks to the health registry and exposes
them through `box.info.health`. The aggregate readiness status is
boolean, while individual checks keep ready, not_ready, or degraded state.

A check starts as `not_ready` on its first failure. Once it was ready,
later failures or callback errors are reported as `degraded`.

This patch also registers built-in readiness checks for `box`, `config`
and `vshard.router`.

NO_DOC=will be added in separate pr

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