Replace directives with brillig opcodes

[kevaundray]

Problem

Brillig is a more general version of directives.

We can now start to replace usage of directives with Brillig opcodes in the compiler.

Happy Case

All directives are replaced.

Alternatives Considered

No response

Additional Context

No response

Would you like to submit a PR for this Issue?

No

Support Needs

No response

[kevaundray]

This issue which needs the sorting directive will be superceded by this once we implement it as brillig bytecode: #1687

[TomAFrench]

Not suggesting that we should do this immediately but once we've migrated all directives to brillig, I think it may be useful to push some of this down to a "brillig stdlib" in similarly to how we have acvm_stdlib.

[kevaundray]

Not suggesting that we should do this immediately but once we've migrated all directives to brillig, I think it may be useful to push some of this down to a "brillig stdlib" in similarly to how we have acvm_stdlib.

That makes sense -- we have a generated_acir folder in ssa_refactor which has components that could also be migrated to acvm_stdlib -- it essentially just deals with acir construction