chore: TagLatency match gin-gonic/gin format

[sixcolors]

Description

TagLatency to match gin-gonic/gin defaultLogFormatter, specifically %13v instead of %7v.

With %7v:

| 4.834µs |
| 1.136834ms |
| 1.000066333s |

With %13v:

|       4.333µs |
|    1.133916ms |
|  1.000057458s |

And, adds Test_Logger_WithLatency, which proves that the logger would show he smallest unit that makes sense. (except for ns, which is probably too fast for most systems to test).

Fixes gofiber#2561

Type of change

Please delete options that are not relevant.

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• Breaking change (fix or feature that would cause existing functionality to not work as expected)
• This change requires a documentation update

Checklist:

• For new functionalities I follow the inspiration of the express js framework and built them similar in usage
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation - /docs/ directory for https://docs.gofiber.io/
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• If new dependencies exist, I have checked that they are really necessary and agreed with the maintainers/community (we want to have as few dependencies as possible)
• I tried to make my code as fast as possible with as few allocations as possible
• For new code I have written benchmarks so that they can be analyzed and improved

Commit formatting:

Use emojis on commit messages so it provides an easy way of identifying the purpose or intention of a commit. Check out the emoji cheatsheet here: https://gitmoji.carloscuesta.me/