Better user logging

[ewang2002]

Instead of having defined properties for each user document, we can have an array of objects, where each object has a key and value property. In this sense, we are able to infinitely "expand" our logging capabilities. For example, instead of having a set property for logging runs, we can have something like this:

[
	{key: "COMPLETED_<dungeon id>_RUNS", guildId: "guild id", value: 15},
	{key: "FAILED_<dungeon id>_RUNS_<guild id>", guildId: "guild id", value: 1}
	// ...
]

In this sense, no longer need to add properties when something new comes out. Instead, we can simply "push" properties into an array of all properties.