[Testing]: Implement comprehensive tests for ERC1155 implementation.

[aapsi]

Add tests for ERC1155Facet and LibERC1155

[aapsi]

Hey @maxnorm
Can I work on this?

[maxnorm]

wassup!

of course

make sure you read the README file inside the testing folder before.

thanks for the contributions

[maxnorm]

This issue was closed by merging PR #166 . Thanks @aapsi for your great work!