JarBytecodeHashAnalyzer swallows IOExceptions

### Affected version

HEAD

### Bug description

This is tricky for API compatibility, but JarBytecodeHashAnalyzer swallows IOExceptions and returns null. Instead it should let the IOException bubble up to the caller so it can handle it appropriately. Deprecate the existing method and add a new method that is declared to throw IOException.

Start by locating JarBytecodeHashAnalyzer, its existing bytecode-hash method, and the callers that depend on its current API. Review the API-compatibility implications, then verify that the existing method is deprecated, the new method declares IOException, and I/O failures reach the caller instead of returning null.

Written by the indexing model from the issue text.