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config: migrate extras module definitions to EE

This patch migrates config.extras module definitions to Tarantool EE.
Now its sources are defined there.

Also, it makes Tarantool validate extras module during a config
initialization phase. It is changed this way to achieve possibility to
load configuration extras after loading the basic config module to
simplify the order of modules loading.

Previous loading order:
* Load `config.extras`.
* Load `config`.
* Load a few more `config.extras`.

New loading order:
* Load `config`.
* Load `config.extras`.

The simplification comes with a cost of less checks in no-configuration
mode though they're not so important since the scenario when we add
`config.extras` and work in no-configuration mode sounds quite strange.

Needed for tarantool/tarantool-ee#1024

NO_CHANGELOG=refactoring
NO_DOC=refactoring, no new api
NO_TEST=no new behavior to test

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