Add roundtrip serialization property tests for types in change sets file

[ebarylko]

Summary

There are property tests in icechunk/src/change_set.rs which check that the composition of serializing and deserializing a ChangeSet is equivalent to the identity function.

Changes

icechunk/src/change_set.rs

• Added arbitraries for the ChangeSet type
• Added a roundtrip serialization test for the ChangeSet type

icechunk/src/format/manifest.rs

• Changed the ManifestExtents strategy used for some of the tests

icechunk/src/strategies.rs

• Added new strategies used for constructing the ChangeSet type in icechunk/src/change_set.rs