test: generalize spender #237
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Protocols integrating Permit2 will probably reuse the utils provided in this repo for their tests.
But the spender in their tests will most likely not be the test-contract itself.
Finding why the signature verification fails due to the hard-coded spender requires quite some knowledge of both Foundry and how certificates work, and is not that straightforward.
By generalising the spender, integrations will be sped up and better tested.
Alternatively I can also move the spender to the structs in ISignatureTransfer?