Add tasks for all the new languages

Task/Prime-decomposition/Sidef/prime-decomposition-1.sidef

@@ -0,0 +1,4 @@
+require('ntheory')
+func prime_factors(n) {
+    [%S<ntheory>.factor(n.to_s)]
+}

Task/Prime-decomposition/Sidef/prime-decomposition-2.sidef

@@ -0,0 +1,18 @@
+func prime_factors(n) {
+    var p = 3;
+    var out = [];
+    return out if (n < 1);
+    while (!(n & 1)) {
+        n >>= 1;
+        out << 2;
+    }
+    while ((n > 1) && (p*p <= n)) {
+        while (n %% p) {
+            n /= p;
+            out << p;
+        }
+        p += 2;
+    }
+    out << n if (n > 1);
+    return out;
+}

Task/Prime-decomposition/Sidef/prime-decomposition-3.sidef

@@ -0,0 +1 @@
+say prime_factors(536870911);