Add addChatPrompt for adding user prompt.

[mk-fan]

Issue #, if available: N/A

Description of changes:

• Fixing typos and minor refactoring
• Add addChatPrompt function to display a user prompt in the chat window

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[mk-fan]

I think exposing updateStore directly to consumer is not the best approach, and instead we should provide more guardrails by creating helper function for tasks such as updating loading state or create/update tabs.

[dogusata]

thx, great work 👏🏻