[H-2] Access Control issue in protcol's critical Snow::changeCollector Function.

Description

The Snow::changeCollector Function can only be called by current collector.since the
collector role can claim the protocol fees of users which can lead to potential high
vulnerability if the current collector becomes malicious or compromised.

Impact:

1.Current collector can change the collector to an unauthorised or malicious address.

2.Can redirect fees to themselves or to any other unintented address.

Proof of Concept

Attack Scenario:

Current Collector can update the address of collector via changeCollector function to malicious address.

Recommended Mitigation

Protcol's critical function must be called by Owner Only.