`noir-examples` tracking issue

[critesjosh]

Examples to add to noir-examples (https://github.com/noir-lang/noir-examples):

Consider adding nightly tests so we are alerted when something breaks

Existing Issues (added in this list because they are in the noir-examples repo, so can't be added as sub-issues):

Higher priority:

• Update recursion noir-lang/noir-examples#51
• Add solidity-example test noir-lang/noir-examples#48
• Update / remove stealthdrop example noir-lang/noir-examples#52
• Enhance GitHub Actions workflows for nightly runs noir-lang/noir-examples#58

Lower prioirty:

• Add string search example using lib noir-lang/noir-examples#31
• add ZK-Regex example using lib generator noir-lang/noir-examples#27
• Add bignum example (from 0.57.0 and later) using lib noir-lang/noir-examples#30
• Add metaprogramming example noir-lang/noir-examples#67