Tracers implementation

[MarcosNicolau]

What ❔

This pr implements tracers for the era_vm. This includes:

• Create Pubdata, Refunds and Circuits tracers.
• Create a tracer manager that manages the new tracers and accepts a custom array of tracers to dispatch.
• Add remaining fields to the ExecutionResult: statistics and metrics collected by the new tracers.
• Add all remaining tests suites, which support this new features.

Why ❔

Checklist

• PR title corresponds to the body of PR (we generate changelog entries from PRs).
• Tests for the changes have been added / updated.
• Documentation comments have been added / updated.
• Code has been formatted via zk fmt and zk lint.

[MarcosNicolau]

Closing this one, as it is being implemented in #253.