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config/schema: deep-merge tables under `any` type

`<schema object>:merge()` now performs a deep merge inside an `any`
scalar value if left-hand and right-hand values are both tables, where
all the keys are strings.

The cluster configuration options that are marked as `any` in the schema
(fields of `app.cfg` and `roles_cfg`) are now merged deeply.

Fixes #10450

@TarantoolBot document
Title: `app.cfg` and `roles_cfg` are now merged deeply

Since Tarantool 3.4.0, 3.3.1, 3.2.2 `<schema object>:merge()` performs a
deep merge for table values marked with the `any` type in the schema if
all the keys in these tables are strings. Please, update the method
description in [1] accordingly.

Fields of `app.cfg` and `roles_cfg` are defined as `any` in the cluster
configuration schema, so now it is possible to set options on different
levels and get a merged result from `config:get()`. The roles
documentation in [2] needs an update, from the following words:

> If a configuration for the same role is provided at different levels
> <...>

[1]: https://www.tarantool.io/en/doc/latest/reference/reference_lua/config/utils_schema/#config-schema-object-merge
[2]: https://www.tarantool.io/en/doc/latest/platform/configuration/#configuration-application-roles

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