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box: expose box_status C API

Make `box_status` function result available in TX thread bypassing lua
stack.

Fixes #11490

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Title: `box_status` exposed in C API.

Added new C function `box_status`, that can be used to get the current
status of the instance. It is either "running", "loading", "orphan" or
"hot_standby" reflecting the box.info.status Lua API behavior. The
return values are:
* running – the instance is loaded
* loading – the instance is either recovering xlogs/snapshots or
  bootstrapping
* orphan – the instance has not (yet) succeeded in joining the required
  number of masters (see orphan status)
* hot_standby – the instance is standing by another instance

```C
const char * box_status(void);
```

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