Add min, max and total request time to top api command

[aweisser]

Community Contribution License

All community contributions in this pull request are licensed to the project maintainers
under the terms of the [Apache 2 license] (https://www.apache.org/licenses/LICENSE-2.0).
By creating this pull request I represent that I have the right to license the
contributions to the project maintainers under the Apache 2 license.

Description

The min, max and total request time gives you a more complete picture of the API "perfomance"
in addition to the already existing avg request time.

Motivation and Context

The additional output helps to understand the latency of the incoming API calls even better.
In particular, how far the min and max RT differ from each other.

Other trace analysis tools like tshark also provide the min, max, avg and sum RT.

How to test this PR?

Execute mc support top api TARGET and watch the output.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Optimization (provides speedup with no functional changes)
• Breaking change (fix or feature that would cause existing functionality to change)

Checklist:

• Fixes a regression (If yes, please add commit-id or PR # here)
• Unit tests added/updated
• Internal documentation updated
• Create a documentation update request here

[klauspost]

Please take out "sum". It doesn't really provide any valuable information, that cannot already be deduced from calls and average.