✨ Add method to get an integer directly from the Ctx params (route params)

[eacp]

Please provide enough information so that others can review your pull request:

I added a method to Ctx and its tests. The method is ParamsInt. It helps developers get an integer directly from the request

Explain the details for making this change. What existing problem does the pull request solve?

It is very common to send integers like IDs directly in the route as parameters. I added an utility function, ParamsInt to directly get an integer from the Ctx that is passed on each request. It returns zero and an error if the param cannot be found OR if the param is not a valid integer

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[ReneWerner87]

Thx for the contribution and effort

Could you add an pull request here
https://github.com/gofiber/docs/pulls

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[ReneWerner87]

thanks for the implementation,

we have internally consulted a bit and merge the pull request, but it may be that we still make optimizations and add another method for floats.

[ReneWerner87]

@eacp
Please don´t forget to add it to our documentation repository
https://github.com/gofiber/docs

[eacp]

@ReneWerner87 I have added the documentation in this pr