Fix all example zkApps inside src/examples, ensure they can all build and execute correctly

[MartinMinkov]

Summary

Some examples in https://github.com/o1-labs/o1js/tree/main/src/examples fail to build when running npm run build:examples. I'd guess that all these errors are because they were assuming an older version of o1js and never updated their APIs. It would be great to get these to build and run again since they are a beneficial resource when everything is up to date.

[barriebyron]

Contributor guidance, submit one PR for each example file

[mitschabaude]

Contributor guidance, submit one PR for each example file

Note: as there are a lot of examples, and many fixes will be trivial, I don't recommend to take that too literally

[dfstio]

It would also be great to publish the examples to some sandbox site like https://stackblitz.com and add links to the sandbox code to the Tutorials docs.

[ymekuria]

It would also be great to publish the examples to some sandbox site like https://stackblitz.com and add links to the sandbox code to the Tutorials docs.

Great idea! We are exploring ways to incorporate something like this.