Add meeting participant removal controls

[AssociationForComputingMachinery-VIT]

Feature request

Add support for removing a participant from an active meeting through Conclave.

Motivation

During the meeting, a participant asked Conclave to remove another attendee. Conclave currently cannot perform this action and directs the host to use the meeting platform controls.

Proposed behavior

• Allow authorized meeting roles (for example, host/co-host) to ask Conclave to remove a named participant.
• Require an explicit confirmation step before the removal is executed.
• Reject requests from unauthorized participants.
• Return a clear success or failure message after the action.

Acceptance criteria

• Conclave can identify the requested participant from the active meeting roster.
• Authorization is checked before any removal action is offered.
• A confirmation is required immediately before removal.
• The removal is performed through the meeting platform integration when authorized and confirmed.
• Errors such as ambiguous names, insufficient permissions, or integration failures are handled clearly.

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Requested by Ishaan during a Conclave meeting.