feat(cli): cannon diff command

[dbeal-eth]

Closes https://linear.app/usecannon/issue/CAN-442/cannon-diff-command-for-validating-contracts-on-project-match-a

this command allows for comparing aspects of cannon state with things.

for the time being, this PR focuses on comparing the cannon state contracts with the ones in a foundry project, highlighting any differences.

notes:

• its possible to filter contracts to compare and source files to compare using the provided options
• exit code matches the nubmer of "differences" found, so only successful output is no diffs (usually what people are checkign for)
• we could do something very similar to hardhat, but lets wait to see how the current impl works with stakeholders

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