Add test code to WASP repo or alternative

[lucas-tortora]

Please add the current code examples used in the ISC docs to the WASP repo. Keep in mind that we should add Solo tests for each.

### Tasks
- [ ] https://github.com/iotaledger/iota-wiki/issues/1610
- [ ] https://github.com/iotaledger/iota-wiki/issues/1611
- [ ] https://github.com/iotaledger/iota-wiki/issues/1612
- [ ] https://github.com/iotaledger/iota-wiki/issues/1613
- [ ] https://github.com/iotaledger/iota-wiki/issues/1614
- [ ] https://github.com/iotaledger/iota-wiki/issues/1615
- [ ] https://github.com/iotaledger/iota-wiki/issues/1616
- [ ] https://github.com/iotaledger/iota-wiki/issues/1617
- [ ] https://github.com/iotaledger/iota-wiki/issues/1618
- [ ] https://github.com/iotaledger/iota-wiki/issues/1619
- [ ] https://github.com/iotaledger/iota-wiki/issues/1620
- [ ] https://github.com/iotaledger/iota-wiki/issues/1621
- [ ] https://github.com/iotaledger/iota-wiki/issues/1622
- [ ] https://github.com/iotaledger/iota-wiki/issues/1623
- [ ] https://github.com/iotaledger/iota-wiki/issues/1624