Supports struct inputs/outputs to Brillig

[vezenovm]

Problem

Brillig inputs are currently limited to singular values for inputs/outputs and are being expanded to support arrays as well in this PR (#1630). However, the PR only supports singular and not nested arrays. Structures are flattened into arrays in SSA thus we need to be able to support nested arrays in order to enable struct input/outputs.

Happy Case

We can use a struct as input to unconstrained fns as well as output to unconstrained fns.

Alternatives Considered

N/A

Additional Context

No response

Would you like to submit a PR for this Issue?

No

Support Needs

No response

[kevaundray]

@vezenovm what is the status of this?

[vezenovm]

This is resolved in #1630.

An example test can be found here: https://github.com/noir-lang/noir/blob/master/crates/nargo_cli/tests/test_data/brillig_nested_arrays/src/main.nr