✨ feat: add strings reverse and strings contain func in utils.strings file

[ShyunnY]

Description

This pr adds two commonly used string functions. I believe that in many cases string reversal and the function of determining whether the string is in the specified slice will be used. Therefore, I write this pr.

Type of change

• New feature (non-breaking change which adds functionality)

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 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

Commit formatting:

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[ReneWerner87]

please also add the internal usage, otherwise we would have to move the whole thing to the utils package
https://github.com/gofiber/utils

[ShyunnY]

please also add the internal usage, otherwise we would have to move the whole thing to the utils package https://github.com/gofiber/utils

There may be codes similar to these two functions inside the fiber, but I haven't found it yet. But when writing logic/service. These two functions are used more often.Maybe you can move there gofiber/utils. @ReneWerner87

[gaby]

I feel like this should go in gofiber/utils/v2

[ShyunnY]

I feel like this should go in gofiber/utils/v2

I do not understand. I can only see gofiber/utils. gofiber/utils/v2 was not found. So should my current PR be resubmitted into gofiber/utils?

[gaby]

I feel like this should go in gofiber/utils/v2

I do not understand. I can only see gofiber/utils. gofiber/utils/v2 was not found. So should my current PR be resubmitted into gofiber/utils?

It's the v2 branch under https://github.com/gofiber/utils

[leonklingele]

Why do we need this as part of fiber? I wouldn’t add code which is not used at all.

[gaby]

@ReneWerner87 Do we move this to utils repo, or close it?