Example Contracts

[LHerskind]

The example contracts are of varying quality and following different schemes to reach the same goals. We should unify them to make it easier for new folks to jump between them and easier to use as inspiration.

Tasks

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1. Use SafeU120 lib for all operations in example contracts #1795
   2 of 2
   A-security +1
2. Fix return values of Noir contracts #2615
   +0
   
3. Token contract with blacklist to showcase SUT #2793
   +0
4. [Noir Contracts] Provide a way for a user to validate the hard-coded function selectors of a contract interface #1551
   C-aztec.nr S-needs-discussion danger +3
5. Replace token implementations with standard. #2177
   9 of 9
   T-tracking +1

[LHerskind]

Since all its subtasks have been finished I'm closing this issue.