feat(go/dp): support dynamic programming (#622)

* feat(go/dp): support climbing stairs

* feat(go/dp): support knapsack

* feat(go/dp): coin_change & edit_distance

codes/go/chapter_dynamic_programming/climbing_stairs_dfs.go

@@ -0,0 +1,21 @@
+// File: climbing_stairs_dfs.go
+// Created Time: 2023-07-18
+// Author: Reanon (793584285@qq.com)
+
+package chapter_dynamic_programming
+
+/* 搜索 */
+func dfs(i int) int {
+	// 已知 dp[1] 和 dp[2] ，返回之
+	if i == 1 || i == 2 {
+		return i
+	}
+	// dp[i] = dp[i-1] + dp[i-2]
+	count := dfs(i-1) + dfs(i-2)
+	return count
+}
+
+/* 爬楼梯：搜索 */
+func climbingStairsDFS(n int) int {
+	return dfs(n)
+}