Resolve minor fixme and todo comments

[Gor027]

Replaced CASS_ERROR_LAST_ENTRY with more descriptive error codes while converting QueryError to CassError.

Set fetching schema metadata flag in SessionBuilder config.

Added port validation in cluster configuration.

Imported Rust driver by commit hash 358eabbbb71c. This enabled to use the allow_remote_dcs_for_local_cl flag while creating a DcAwareRoundRobinPolicy.

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.