refactor: rename imports

BREAKING!
Since the folder name determines the import name (i.e. lib.callbacks), use better names and lowerCamelCase.

imports/callback/server.lua

@@ -0,0 +1,14 @@
+local ServerCallback = {}
+
+---@param name string
+---@param callback function
+--- Registers an event handler and callback function to respond to client requests.
+ServerCallback.Register = function(name, callback)
+	name = ('__cb_%s:%s'):format(GetCurrentResourceName(), name)
+
+	RegisterServerEvent(name, function(id, ...)
+		TriggerClientEvent(name..id, source, {callback(source, ...)})
+	end)
+end
+
+return ServerCallback