feat: Brillig opcode diff report for programs

[vezenovm]

Description

Problem*

Resolves

Summary*

This PR simply adds similar handling for Brillig functions as already exists for normal ACIR circuits. The "unconstrained_functions" field in the info report produced by nargo info is now handled. Tests have been updated to account for this extra field.

Additional Context

• This PR only handles Noir compiled with --force-brillig. This was made as the goal is to profile Brillig bytecode compilation optimizations in general, not enabling developers to look at opcode sizes of individual functions like for circuits. Either way, support for multiple functions in a report needs to be added for ACIR as well. I felt this can come in a follow-up.
• Unconstrained functions in contracts have not been updated in this PR.

PR Checklist*

• I have tested the changes locally.
• I have formatted the changes with Prettier and/or cargo fmt on default settings.