Replace BitVector by BitSet and remove legacy library

[mbastian]

No description provided.

[Copilot]

Pull Request Overview

This PR replaces the legacy BitVector from the Colt library with Java's standard BitSet class and removes the Colt dependency from the project.

Key changes:

• Migrated from cern.colt.bitvector.BitVector to java.util.BitSet across all graph implementation classes
• Updated serialization/deserialization logic to maintain compatibility with legacy BitVector format
• Replaced BitVector-specific operations (copy(), not(), size()) with BitSet equivalents (clone(), flip(), length())

Reviewed Changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
pom.xml	Removed the Colt library dependency
Serialization.java	Updated serialization methods to handle BitSet while maintaining backward compatibility with BitVector format
GraphViewImpl.java	Replaced BitVector with BitSet, updated bit operations, and simplified vector resizing logic
ColumnObserverImpl.java	Migrated from BitVector to BitSet and removed manual growth logic
SerializationTest.java	Updated test cases to use BitSet and added comprehensive serialization test

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