Add more test coverage

[tomwade]

Following a forge coverage call, I've seen a number of small areas that will need some more test coverage. I've made the following notes against the generated report:

Notes

• The UniswapV3Strategy.sol generates a "Stack Too Deep" error, due to the positions() function returning too many variables when the call is not optimised.
• There is no coverage of the scripts, and with the exception of the DeploymentScript.sol file, I don't think we need any
• I don't think we need to cover contracts in the forks folder, as it is directly copied from fully audited codebases
• I don't think we need to cover contracts in the tests folder, as these are mostly mocks or utilities

Actions

• actions/llamapay/Withdraw.sol has no tests
• EpochManager.sol is missing some function tests
• actions/Action.sol has no tests
• actions/nftx/BuyNftsWithEth.sol has no tests
• actions/utils/Multicall.sol has no tests
• actions/utils/RawTx.sol has no tests

[tomwade]

From reviewing this issue, I'm not happy with the multicall implementation. I am going to delete it in this PR and then research and implement a new version if required.

[tomwade]

Test coverage has now been updated on branch. I'll regenerate the coverage in the morning and will compare the output.