Fiber v3 Client

[goriunov]

I have been trying out fiber v3 client and noticed that it does not allow to configure underline fasthttp client in any way, was not sure if this should be opened as discussion or issue, just throwing in idea may be we should allow passing custom fasthttp client for people to allow to fine-tune it :)

[gaby]

@goriunov Can you open this as a feature request in https://github.com/gofiber/fiber

Thanks

[goriunov]

Created #3107 with some basic details

[gaby]

Thank you