[redis_proxy] Add support for SELECT and KEYS

[duanhongyi]

This RP mainly improves the compatibility of redis proxy, improvement as follows:

• Add support for the select command, referring to the implementation of Apache KVRocks and Microsoft Garnet, simply returns OK.
• Add keys command support, send keys commands to each shard on the backend, and then merge the results.
• For unsupport commands, the return value is the same as Redis, because some clients judge this return value, for example, Java lettuce client

[repokitteh-read-only]

Hi @duanhongyi, welcome and thank you for your contribution.

We will try to review your Pull Request as quickly as possible.

In the meantime, please take a look at the contribution guidelines if you have not done so already.

🐱

Caused by: #37706 was opened by duanhongyi.

see: more, trace.

[adisuissa]

Assigning @weisisea @mattklein123 as codeowners
/assign @weisisea @mattklein123

[mattklein123]

LGTM at a high level. Can you fix the typo comments and then push to see if we can get CI green?

/wait

[duanhongyi]

I rebased the last commit, mainly to solve the compatibility issues of the Java client.

@mattklein123

[duanhongyi]

There is still one that hasn't turned green, I will add some test cases later.

Code coverage for source/extensions/filters/network/redis_proxy is lower than limit of 96.6 (95.5)

[duanhongyi]

Okay, all the checks have been passed.

@mattklein123