TDigest: Implement CREATE and INFO command for TDigest Algorithm

[LindaSummer]

Search before asking

• I had searched in the issues and found no similar issues.

Motivation

Refer: #2558
We should implement TDIGEST.CREATE and TDIGEST.INFO commands.
We can use these two commands to create the first integration go tests.

Redis command reference:

• https://redis.io/docs/latest/commands/tdigest.create/
• https://redis.io/docs/latest/commands/tdigest.info/

Solution

Leverage the implementation of #2741 for these commands.

We can follow some other command's example such as STREAM #745.

Are you willing to submit a PR?

• I'm willing to submit a PR!