refactor: modularize foundry-evm

[DaniPopes]

Motivation

Closes #6052

foundry-cheatcodes integration will happen in a follow up

Solution

See #6052

No functional changes.

Breakage in foundry_evm interface:

• executor -> executors
• executor::{<modules>} -> ::{<modules>}
• executor::inspector -> inspectors
• trace -> traces
• executor::backend::{error, snapshot} inlined into super
• DatabaseRef and HashMap re-export removed in favor of their own crate re-export (revm and hashbrown respectively)
• executor and inspector types moved from submodule to executors and inspectors
  • inspectors are re-exported, executors were moved, thus inspectors are available in both
• executor::fuzz::invariant partially split to executors::invariant
• cheatcode utils merged into root utils
• CallKind and StateChangeset moved into utils

[mattsse]

this is so much better

[mattsse]

nice, finally constants in one place