Make object storage and region configurable

[karitra]

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Description

It possible to configure Yandex API endpoint, but storage endpoint bind to the constant in the source code, is it possible to allow customization of storage and region via configuration or, if supported by Yandex API, make it configurable via API calls? For first case I've modest patch, so would gladly post it as PR, if acceptable by code maintainers.

Use Case(s)

Use of Yandex packer plugin in custom/nonstandard environments with different storage endpoint and region settings.

Potential configuration

storage_endpoint: "storage.north-3.yandex-cloud.net"
storage_region: "ru-north-3"

[karitra]

It seems that according YandexCloud API docs it is possible to resolve Storage API endpoint via YandexCloud API call: https://cloud.yandex.com/en-ru/docs/api-design-guide/concepts/endpoints. It is placed within response with "storage" key.