Add latency histogram

[NaughtySora]

Adding LATENCY HISTOGRAM command.
I personally will use this in my current and future projects.
#1955

I have tried to run all the tests locally but facing the same issue with timeout as before.

• Does npm test pass with this change (including linting)?
  Tests are present.
• Is the new or changed code fully tested?
  I think documentation about commands located in redis official website.
• Is a documentation update included (if this change modifies existing APIs, or introduces new ones)?

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[nkaradzhov]

Hi @NaughtySora, thanks again for the contribution! There are couple of issues, i have created a PR to your branch with fixes.

1. Add some tests for RESP3
2. Change histogram_usec to be a map

[NaughtySora]

Hi, thank you so much for the amends.
I will be more careful next time with REST 2/3 and redis documentation.