fix: validate binary input in _from_bytes()

[sumanjeet0012]

Fixes #110

Description

This pull request adds strict validation to the binary multiaddr parser. It updates _from_bytes() to parse components iteratively using bytes_iter(), ensuring invalid bytes are rejected immediately upon initialization rather than failing later during conversion. It also updates bytes_iter() to catch truncated streams.

Changes

• Updated Multiaddr._from_bytes() to validate raw binary components fully and raise a BinaryParseError upon encountering unexpected bytes.
• Updated bytes_iter() to raise a BinaryParseError if a component's byte length is shorter than expected.
• Added test_invalid_bytes() to tests/test_multiaddr.py to test various invalid multiaddr byte strings.
• Added a towncrier newsfragment newsfragments/110.bugfix.