支持SM3密码认证 · Pull Request !6 · openGauss/openGauss-connector-go-pq

### 相关的Issue

无

### 原因（目的、解决的问题等）

支持SM3密码认证

### 描述（做了什么，变更了什么）

支持SM3密码认证.
startup方法增加了sm3分支认证

```
	case AuthReqSm3: // sm3
		passwordStoredMethod := r.int32()
		if passwordStoredMethod == Sm3Password {
			random64code := string(r.next(64))
			token := string(r.next(8))
			serverIteration := r.int32()

result := RFC5802Algorithm(cn.config.Password, random64code, token, "", serverIteration, "sm3")
			if len(result) == 0 {
				errorf("Invalid username/password,login denied.")
			}

w := cn.writeBuf('p')
			w.buf = []byte("p")
			w.pos = 1
			w.int32(4 + len(result) + 1)
			w.bytes(result)
			w.byte(0)
			cn.send(w)

t, r := cn.recv()

if t != 'R' {
				errorf("unexpected password response: %q", t)
			}

if r.int32() != 0 {
				errorf("unexpected authentication response: %q", t)
			}
		} else {
			errorf("The password-stored method is not supported ,must be sm3.")
		}
```

### 测试用例（新增、改动、可能影响的功能）

```
{
    name: "sm3",
    args: args{
        password:        "sm3@abc123",
        random64code:    "5ae737626add65f8da1b063104a6c4e2dc25b7343d8512a74826dc5b5e3e5188",
        token:           string([]byte{0, 0, 0, 0, 0, 0, 0, 0}),
        serverSignature: "",
        serverIteration: 10000,
        method:          "sm3",
    },
    want: []byte{48, 48, 57, 102, 56, 52, 52, 99, 49, 57, 56, 48, 102, 53, 48, 49, 99, 54, 54, 99, 54, 56, 52, 49, 50, 98, 48, 97, 98, 99, 98, 53, 97, 101, 49, 55, 54, 100, 101, 51, 50, 102, 102, 98, 98, 98, 97, 101, 57, 55, 48, 98, 56, 50, 57, 50, 50, 49, 99, 100, 48, 99, 48, 56},
},
```

类型	指派人员	状态
审查	opengauss-bot	已完成 (0/0人)
测试	opengauss-bot	已完成 (0/0人)

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