Refinements for Enterprise De-Coupling

[MinuraPunchihewa]

This PR aims to achieve the following,

• The explicitly provider coding model parameters (to the scratchpad) are removed because these already exist in the LLM client.
• The data source components including the data vault and the data registry are moved to the core as these will be required for the host application. In Minds, we can start to move to this instead of using the federated query engine.
• Introduced a SystemPromptContext parameter when initializing sessions to manage where parts of the prompt get included.