feat(query): Support access Redis data from dictionaries via the dict_get function.

[Winnie-Hong0927]

I hereby agree to the terms of the CLA available at: https://docs.databend.com/dev/policies/cla/

Summary

This pull request introduces support for accessing Redis data from dictionaries using the dict_get function. Other source like MySQL, PostgreSQL will be introduced in the future PRs.

1. Dictionary Creation with Redis Source:

CREATE OR REPLACE DICTIONARY d(key string not null, value string not null) PRIMARY KEY key SOURCE(redis(host='127.0.0.1' port='6379'))

options are used to provide the Redis connection URL, host and port are required options, and username, password, db_index are optional options.

connect to Redis and set some test keys and values

redis-cli -h 127.0.0.1 -p 6379
127.0.0.1:6379> set a abc
OK
127.0.0.1:6379> set b def
OK
127.0.0.1:6379>

2. Data Access with dict_get Function:

MySQL [(none)]> create or replace table t(a string);
Query OK, 0 rows affected (0.201 sec)

MySQL [(none)]> insert into t values('a'),('b'),('c');
Query OK, 3 rows affected (0.095 sec)

MySQL [(none)]> select a, dict_get(d, 'value', a) from t;
+------+---------------------------------+
| a | dict_get(default.d, 'value', a) |
+------+---------------------------------+
| a | abc |
| b | def |
| c | |
+------+---------------------------------+
3 rows in set (0.173 sec)

• The result corresponds to the value stored in Redis associated with the keys in table column a.
• If the key is not exists in the Redis, a default value will be inserted instead.

This PR also introduces a mock_source, which simulates a Redis server to test the dict_get function. Future work will expand this mock data source functionality to include support for other sources such as MySQL, PostgreSQL, and more.

part of #15901

Tests

• Unit Test
• Logic Test
• Benchmark Test
• No Test - Explain why

Type of change

• Bug Fix (non-breaking change which fixes an issue)
• New Feature (non-breaking change which adds functionality)
• Breaking Change (fix or feature that could cause existing functionality not to work as expected)
• Documentation Update
• Refactoring
• Performance Improvement
• Other (please describe):

---

This change is