Add a `tsconfig.json` for the test folder.

[Marketen]

If we dont, we miss compilation errors of files inside /test folder.

It may be useful to remove the "test/**/*" part in the existing tsconfig.json inside dappmanager module https://github.com/dappnode/DNP_DAPPMANAGER/blob/a92041070e733076328ed6d7017cb1aceadb4e44/packages/dappmanager/tsconfig.json#L22C43-L22C43