feat: Cache invalidation on zksolc version change

[MBerguer]

What 💻

• Updating the can_use_cached in zksync, so it accounts for the selected version as well
• Adding two tests;
  • test_zk_cache_ok is a very basic test that asserts the cache is working correctly (must have)
  • test_zk_cache_invalid_on_version_changed to demonstrate that changing the zksolc version now recompiles the project.

Why ✋

• This was a bug, we need to recompile after changing this setting because this affects the artifacts directly.

Evidence 📷

Before this change, we had this situation:

user@local % forge build --zksync
[⠃] Using zksolc-1.5.6
[⠊] Compiling (zksync)
[⠑] Compiling 27 files with zksolc and solc 0.8.28
[⠃] zksolc and solc 0.8.28 finished in 2.72s
Compiler run successful!
user@local % nano foundry.toml        
> zksolc = "1.5.8"
user@local % forge build --zksync
[⠃] Using zksolc-1.5.8
[⠒] Compiling (zksync)
No files changed, compilation skipped

Now, it is recompiling after the change.

Documentation 📚

Please ensure the following before submitting your PR:

• Check if these changes affect any documented features or workflows.
• Update the book if these changes affect any documented features or workflows.