Add support for compression

[Gor027]

The original C++ driver does not support compression, so new APIs are introduced. CassCompressionType enum is added with values CASS_COMPRESSION_LZ4 and CASS_COMPRESSION_SNAPPY, those are the only compression algorithms that Rust driver supports currently.

Added cass_cluster_set_compression that sets the preferred compression type in the SessionBuilder object of the cluster.

Fixes #91

Pre-review checklist

• [x] I have split my patch into logically separate commits.
• [x] All commit messages clearly explain what they change and why.
• [x] PR description sums up the changes and reasons why they should be introduced.
• [ ] I have enabled appropriate tests in .github/workflows/build.yml in gtest_filter.
• [ ] I have enabled appropriate tests in .github/workflows/cassandra.yml in gtest_filter.

[Lorak-mmk]

This is a new functionality so it needs some test - even a simple one (just connecting to a cluster with compression) will suffice.