Add Functionality to Fetch Entire Folder Content from Knuu Instance

[staheri14]

Problem

When there's a need to retrieve the content of a folder from a Knuu instance, users must individually specify each file by invoking GetFileBytes function, which only supports reading single files. To streamline this process, it would be highly beneficial to implement a feature that allows fetching all the files/subfolders within a folder without needing to name each of them individually.

Acceptance Criteria

• [ ] Adding a function or expanding the existing GetFileBytes to support retrieval of an entire folder's content

[mojtaba-esk]

@staheri14 is it mostly required on a running instance or an instance that has not started yet?

[staheri14]

@staheri14 is it mostly required on a running instance or an instance that has not started yet?

We need to pull data from a running instance.

[smuu]

not needed right now, low prio

[smuu]

Duplicate off https://github.com/celestiaorg/knuu/issues/292