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

Beta Give feedback

1. https://wiki.iota.org/isc/how-tos/core-contracts/introduction/ #1610
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2. https://wiki.iota.org/isc/how-tos/core-contracts/basics/get-balance/ #1611
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3. https://wiki.iota.org/isc/how-tos/core-contracts/basics/allowance/allow/ #1612
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4. https://wiki.iota.org/isc/how-tos/core-contracts/basics/allowance/get-allowance/ #1613
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5. https://wiki.iota.org/isc/how-tos/core-contracts/basics/allowance/take-allowance/ #1614
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6. https://wiki.iota.org/isc/how-tos/core-contracts/basics/send-assets-to-l1/ #1615
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7. https://wiki.iota.org/isc/how-tos/core-contracts/token/create-native-token/ #1616
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8. https://wiki.iota.org/isc/how-tos/core-contracts/token/mint-token/ #1617
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9. https://wiki.iota.org/isc/how-tos/core-contracts/token/erc20-native-token/ #1618
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10. https://wiki.iota.org/isc/how-tos/core-contracts/token/create-foundry/ #1619
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11. https://wiki.iota.org/isc/how-tos/core-contracts/token/register-token/ #1620
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12. https://wiki.iota.org/isc/how-tos/core-contracts/nft/mint-nft/ #1621
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13. https://wiki.iota.org/isc/how-tos/core-contracts/nft/use-as-erc721/ #1622
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14. https://wiki.iota.org/isc/how-tos/core-contracts/get-randomness-on-l2/ #1623
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15. https://wiki.iota.org/isc/how-tos/core-contracts/call-view/ #1624
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[salaheldinsoliman]

@lucas-tortora I will take on the first 3 contracts, it's a good way to get started with Solo and investigate the Wasp repo