[C + B] Expose methods to control number of arrows stuck on entity.  Adds BUKKIT-3721

**The Issue:**
There is currently no method of getting or altering the number of arrows displayed on the client as stuck in the player.

**PR Breakdown:**
This PR, in conjuncture with its Bukkit PR counterpart, adds this functionality, allowing developers to take advantage of it as they please.

**Bukkit PR:**


**JIRA Ticket:**
https://bukkit.atlassian.net/browse/BUKKIT-3721