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config: add `include` field for config files

Closes #11583
Closes TNTP-229

@TarantoolBot document
Title: config: `include` section for config files.

Using this section it is possible to include one or several other config
files from any config file. This is a top level field for file-based
configuration. If present, this field must be an array of strings.
Each entry in this array can be an absolute or relative path to a config
file to be included, or a wildcard pattern. Relative path are considered
relative to the file, where they are included.
Include section can be placed inside a `conditional` section.
The non-existing included files are skipped. If an included file exists
and is not a valid tarantool config file, an error will be raised.

Example config.yaml:
```yaml
include:
  - config_a.yaml
  - /etc/tarantool/config_b.yaml
  - conf.d/*.yaml
```

For the provided example the resulting configuration will be merged
according to the rules:
1. Config file provided by `--config` flag is read (`config.yaml` in
   our example).
2. `config_a.yaml` from the same directory as the `config.yaml` is
   merged onto it.
3. Recursively, the includes of `config_a.yaml` are merged onto the
   configuration.
4. `/etc/tarantool/config_b.yaml` is merged.
5. Recursively, the includes of `/etc/tarantool/config_b.yaml` are
   merged onto the configuration.
6. For each config file, matching the wildcard pattern, in alphabetical
   order the configuration from the file itself is merged, then its
   includes are processed recursively, before processing the next
   wildcard match.

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