Add multiple prefixes for "no entity" generation in bigbang mode

[fdelbrayelle]

Overview of the feature request

In bigbang mode, the user should be able to input multiple prefixes when choosing no entity for the object generation (consumer, producer, ...) and its configuration.

Motivation for or Use Case

Currently, the user can only choose one prefix in bigbang mode generation unlike incremental mode where it's possible to loop in prompts and add multiple prefixes.

Related issues or PR

#57 where "no entity mode" has been implemented.

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