fix(abi): handle imports in leo abi (#29437)

`leo abi` on a `.aleo` file that declares imports now loads each dependency
from a sibling `imports/` directory (or `--imports-dir`) before disassembling.
With `-o DIR`, every ABI (main and deps) is written to `<DIR>/<name>.abi.json`.
Network builtins like `credits.aleo` are picked up from the snarkVM `Process`
and don't need to be on disk.

Co-Authored-By: Claude Opus 4.7 <noreply@anthropic.com>

Author: Mohammad Fawaz

crates/abi/src/aleo.rs

@@ -177,7 +177,7 @@ mod tests {
 
     const SIMPLE_ALEO: &str = include_str!("../../../tests/tests/cli/test_abi_from_aleo/contents/simple.aleo");
     const SIMPLE_ABI: &str =
-        include_str!("../../../tests/expectations/cli/test_abi_from_aleo/contents/simple.abi.json");
+        include_str!("../../../tests/expectations/cli/test_abi_from_aleo/contents/simple_out/simple.aleo.abi.json");
 
     #[test]
     fn generate_from_bytecode_matches_existing_cli_fixture() {