Implement fold and try_fold using NomBounds

[Stargateur]

This is yet another way to Closes #1393 I like this very much I found it's like a fusion of #1402 and #1407

• More factorize than fold range implementation #1407
• More reusable, this way could be use by a lot of other nom parser every parser that have variant 0 1 n_m etc... see escaped(digit1, ...) succeeds for empty string #1383
• Could be better, did someone say GaT ?
• more straightforward than [WIP] Feature multi range #1402

It's hard to tell what implementation is faster between the 3 implementations, I think we need a benchmark, I expect #1407 faster than this faster than #1402 but anyway could be wrong and bench != real world application.

I'm still not a big fan to check #1333 at least in the current state, I think it's should be user problem, but I did it anyway as a PoC.

Todo:

• fold
• try_fold
• many with extend
• usize for NomBounds
• doc
• tests
• benchmark 3 solutions (+1 old fold_many_n_m)

PS: ControlFlow is stable since 1.55 but I don't expect the range feature for any soon so will maybe fix if needed when the time will come.

@cenodis @epage

[coveralls]

Coverage decreased (-0.9%) to 83.091% when pulling 26f57ac on Stargateur:range_v2 into d15a266 on Geal:master.