Namespace should be consistent

[AsakusaRinne]

Due to my neglection, the main package LLamaSharp uses the root namespace LLama but LLamaSharp.semantic-kernel and LLamaSharp.kernel-memory are using LLamaSharp.

We should take a good timepoint to refactor it to keep the namespace consistent, maybe in the next major release (1.0.0).

[martindevans]

Which one should we change? Changing the main package to LLamaSharp is more consistent, but is the bigger impact change.

[AsakusaRinne]

In my opinion we should use the LLama namespace everywhere. Though LLamaSharp is more suitable, changing it will impact too much.

[github-actions]

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