Adopt strict memory safety annotations in BinaryParsing

[natecook1000]

This adds the required @unsafe and unsafe annotations to enable strict memory safety for the BinaryParsing module.

Checklist

• I've added at least one test that validates that my change is working, if appropriate
• I've followed the code style of the rest of the project
• I've read the Contribution Guidelines
• I've updated the documentation if necessary