Tracking examples with Noir libs

[jzaki]

• BigNum examples from here (in sub-issues)
• Base64 examples from here (in sub-issues)
• RSA example from here (maybe after 0.57.0)
• String search examples for here (in sub-issues)
• Regex examples part of zkEmail? (in sub-issues)

[jzaki]

Related - AztecProtocol/dev-rel#132

[critesjosh]

For these examples, is the intention to use pinned version numbers?

Or should we set up some testing that checks if a newer version of Noir is going to break these examples and notify us that we should update them?

[critesjosh]

Let's use pinned version numbers, and add to noir-examples repo.