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config: add env option to config:get()

Closes #9824

@TarantoolBot document
Title: Add the "env" option to config:get()
Since: 3.7.0

The new option allows controlling whether TT_* environment variables
are taken into account when retrieving configuration values.

Root document: https://www.tarantool.io/en/doc/latest/reference/reference_lua/config/#lua-function.config.get

* The `env` option controls the usage of `TT_*` environment variables
  in `config:get()`.
* By default, environment variables are taken into account when the
  `instance` option is not specified.
* If `env` is set to `false`, environment variables are ignored even
  when the `instance` option is not specified.
* If `env` is set to `true` together with the `instance` option, an
  error is raised.

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