Near-plugins integration

[karim-en]

Integrate near plugins to the bridge token factory and ft token locker.

Details:

• The near plugins weren't integrated into the bridge token because they are fully controlled by the factory contract.
• Added upgrade_bridge_token(&self, address: String) to upgrade the bridge token from the factory.
• Added set_paused_withdraw(&mut self, address: String, paused: bool) to pause the token from the factory.
• Added upgrade_and_migrate to the bridge token contract, which applies the upgrade and calls migrate(from_version: u32) where the from_version is passed as an argument to be able to migrate from version A to C if the upgrade to B was missed by mistake.

[UrAvgDeveloper]

Can we add access control plugin in bridge token contract as well? this way we don't need admin-controlled as well maybe and can configure access according to functions