create a mob that looks like a iron_golem which has the following appearance: 'Create an Iron Golem with a weathered ancient stone appearance covered in glowing blue runes and moss patches that pulse softly, giving it a mystical protector vibe while retaining its towering shape and peaceful demeanor.' and the following behavior/capabilities: 'A golem that does not spawn naturally. When summoned, the player must Shift + right-click the golem to activate it. Then, the player Shift + right-clicks a chest to select it as the source of building blocks. Finally, the player Shift + right-clicks a location, and the golem builds the structure from the schematic file at that spot, using only blocks from the selected chest'
