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log: encode table arguments in json

This is more convenient than calling `json.encode` manually.
It is also more efficient in case logging is skipped due to
the log level.

Closes #8611

@TarantoolBot document
Title: Document that logger now encodes table arguments in JSON

How it used to work:

```
tarantool> require('log').info('%s', {foo = 'bar'})
table: 0x41f9d2e8
```

How it works now:

```
tarantool> require('log').info('%s', {foo = 'bar'})
{"foo":"bar"}
```

Note, JSON encoding is enabled only for tables that don't have
the `__tostring` meta-method:

```
tarantool> require('log').info('%s', setmetatable({foo = 'bar'}, {__tostring = function() return 'foobar' end}))
foobar
```

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