feat: extensive hint init

[drspacemn]

Issue Number: #58

Type

• feature
• bugfix
• dev (no functional changes, no API changes)
• fmt (formatting, renaming)
• build
• docs
• testing

Description

Allow for extensive hints in our hint processor by implementing the VM trait.

/// Hint Extensions extend the current map of hints used by the VM.
/// This behaviour achieves what the `vm_load_data` primitive does for cairo-lang
/// and is needed to implement os hints like `vm_load_program`.

Breaking changes?

• yes
• no