[not sure] Use .binary_search when inserting and removing to/from a vec storage item

[subsocialdev]

This is a performance optimization task.

Examples:

• Insert: https://github.com/paritytech/substrate/blob/master/frame/proxy/src/lib.rs#L197
• Remove: https://github.com/paritytech/substrate/blob/master/frame/proxy/src/lib.rs#L233