Kill credit for End Crystals and/or TnT

[xpple]

Description of the feature
The person that triggers the End Crystal would get kill credit for anyone that dies due to the explosion of the End Crystal. Same for TnT, the person that ignites the TnT would get kill credit for anyone that dies due to the explosion of the TnT.

How the feature is useful
On anarchy servers, the best stable PvP meta is with End Crystals. However, this meta is hard to learn. And thus, there are practice servers that let you practice the meta.
For me, that means every player can create a kit, with their own customisation. So they may choose for more End Crystals, and less Totem of Undyings. To truly see who is the best at the game mode, a good representation of everyone's kills is necessary. With the End Crystal being their main weapon, the leaderboard is currently not a good representation, and players don't or barely level up.