🐛 bug: fix middleware naming and returned values of group methods

[ytsruh]

Description

Edited app.Name() method to add a name parameter to reach route unless already assigned. This required looping over app.stack which feels ineffecient but it was the only method of accessing all of the routes that I could find

Fixes # (issue)
Resolves #2467

Type of change

• Bug fix (non-breaking change which fixes an issue)

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

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[ytsruh]

Updated to pass lint rules & moved the variable outside of the loop

[ReneWerner87]

Will check it tomorrow

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