The explorer should offer a set of functions to retrieve structured data from the DB

# 🤔 How RocksDB works
The database is a **key-value store**, where keys and values are arbitrary bytes arrays. In our implementation the arrays are:

- 🔑 **Key**: `identifier_0:identifier_1:...:identifier_K`

Where `:` is the divisor between identifiers

- 📄 **Value**: `12200bf4c94e56f18f32243...25ef86a16c37d3d4b9d9b51671` (binaries)

Values can represent any type of object.

# 👷 What to do

It is necessary to construct a **set of functions** that:

- construct the view
- collect the result