Fix I/O error handling in ElfFile::from_path

[maradini77]

#### Is this resolving a feature or a bug?

Bug fix

#### Are there existing issue(s) that this PR would close?

No

#### Describe your changes.

Replaces panic-prone file reading in `ElfFile::from_path` with proper error handling.

**Problem:**
The method used `std::io::Read::bytes().expect()` which would panic on any I/O error (corrupted file, permission denied, interrupted read), despite returning `Result<Self, VMError>`.

**Solution:**
Changed to use `fs::read()` which properly converts I/O errors to `ParserError::IOError`, maintaining the error propagation contract and preventing unexpected panics.

**Impact:**
- I/O errors are now properly returned instead of causing crashes
- Maintains consistent error handling throughout the ELF loading pipeline
- Improves robustness when dealing with malformed or inaccessible files

[sjudson]

@maradini77 tests are failing

[sjudson]

One minor nit.

[sjudson]

Can you move this down to within the existing #[cfg(test)] block around L137?