K8SSAND-1745 ⁃ Strongly type CassandraTask job arguments

[burmanm]

What is missing?
Currently the job arguments are map[string]string, which means the user has no strict typing of available values. That also restricts our argument types to simple strings, which is not what we want with for example compaction requests.

Why do we need it?

Environment

• Cass Operator version:

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  **Anything else we need to know?**:

┆Issue is synchronized with this Jira Task by Unito
┆friendlyId: K8SSAND-1745
┆priority: Medium