Add rocc-to-noc example

[jerryz123]

This adds an example rocc "accelerator" that communicates with other RoCC accelerators over a constellation-generated NoC.

I'll try to add some docs for this soon.

Related PRs / Issues:

Type of change:

• Bug fix
• New feature
• Other enhancement

Impact:

• RTL change
• Software change (RISC-V software)
• Build system change
• Other

Contributor Checklist:

• Did you set main as the base branch?
• Is this PR's title suitable for inclusion in the changelog and have you added a changelog:<topic> label?
• Did you state the type-of-change/impact?
• Did you delete any extraneous prints/debugging code?
• Did you mark the PR with a changelog: label?
• (If applicable) Did you update the conda .conda-lock.yml file if you updated the conda requirements file?
• (If applicable) Did you add documentation for the feature?
• (If applicable) Did you add a test demonstrating the PR?

• (If applicable) Did you mark the PR as Please Backport?

[abejgonzalez]

LGTM

[jerryz123]

Delay this to post-release. I'd like to add some docs for this, but I won't have time until post-release

[joonho3020]

@jerryz123 Can we just merge this in? Seems like the example is self sufficient by itself.

[jerryz123]

I probably need to write some docs/comments