[FEAT] add context to get approval request

[edwinkys]

Feature Description

We should add context to GetApprovalRequest so that the client can relay some form of additional context related to the function that is going through the approval process. This should help the approver understand the function with its parameters that is going to executed by the AI agent.

Potential Solution

• Add context of string type (We likely won't need this to be JSON string).
• This context should be able to be passed on by the client to the approver.
• Context doesn't need to be returned back to the client in the approval response.