fix(astra): Replace depricated 'namespace' param name

[jeheskielSunloy77]

Replace all 'namespace' with 'keyspace' in AstraLibArgs and related methods.
The 'namespace' terminology has been removed, and replaced with 'keyspace' throughout the client.
using 'namespace' currently will throw property exist error, this hotfix will handle that

@jayquery_ (on x.com) thanks!

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