Add /scanchests Command

[CoderCow]

Command: /scanchests

Purposed syntax: /scanchests <item name> [page]
Purposed permission: prot.scanchests
Purposed description: Searches all chests in the current world for items matching the given name. The user will be able to teleport to the chests found by this command using /tpchest.

Purposed output:

The Following Chests Contain "<item name>"
<result index>. Chest owned by <player name> contains <item> [item ...]
<result index>. Chest owned by <player name> contains <item> [item ...]
...
Type /tpchest <result index> to teleport to the respective chest.

Command: /tpchest

Purposed syntax: /tpchest <result index>
Purposed permission: prot.scanchests
Purposed description: Teleports you to a chest that was found by the /scanchests command.

Related: #55