tarantool / go-config / 25319893521

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config: add MutableConfig.Snapshot for stable read views

Add Snapshot method that returns a deep-copied Config so a long-lived
reader can hold a stable view while another goroutine continues
mutating the live configuration.

- Without it, the RWMutex protects only single calls, not the lifetime
  of values the caller keeps.
- The snapshot is decoupled from the live MutableConfig, so concurrent
  writes after Snapshot returns are not observed.

Part of TNTP-5724

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