Add DoInAttemptWithDelay and DoInAttempt functions

[marktiro]

The Attempt like functions are awesome and help a lot with operations prone to fail, i.e. networking stuff.

Nevertheless, only procedure implementation is available in the library. So, it forced me to use constructions like the following:

fooOut, err := func() (FooOut, error) {
	var fooOut FooOut
	var err error
	_, _ = Attempt(10, func(_ int) error {
		fooOut, err = foo()
		return err
	})
	return fooOut, err
}()

I ended up doing this stuff so often, so I decided to contribute if you do not mind :)

[samber]

Why not just implement Attempt0, Attempt1, Attempt2 ... AttemptX ?

[marktiro]

Why not just implement Attempt0, Attempt1, Attempt2 ... AttemptX ?

it's been a while since your reply 😄

Actually, you are completely right, I will rewrite the functions to ones with numbers at the end 👌