Add tasks for all the new languages

Task/Variadic-function/jq/variadic-function-1.jq

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+def demo: .[];

Task/Variadic-function/jq/variadic-function-2.jq

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+args | demo

Task/Variadic-function/jq/variadic-function-3.jq

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+["cheese"] + [3.14] + [[range(0;3)]] | demo

Task/Variadic-function/jq/variadic-function-4.jq

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+"cheese"
+3.14
+[0,1,2]

Task/Variadic-function/jq/variadic-function-5.jq

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+# arity-0:
+def f: "I have no arguments";
+
+# arity-1:
+def f(a1): a1;
+
+# arity-1:
+def f(a1;a2): a1,a2;
+
+def f(a1;a2;a3): a1,a2,a3;
+
+# Example:
+f, f(1), f(2;3), f(4;5;6)

Task/Variadic-function/jq/variadic-function-6.jq

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+1
+2
+3
+4
+5
+6