[benchmark] RomanNumbers Redux
[benchmark] RomanNumbers Redux

Rewrite of the `RomanNumbers` benchmark that fixes error in the `position` which was always reset to 0 after `continue outer`, by swapping the `while` and `for-in` loops into more natural order, which eliminates the need for using `position` at all. This is based on examples from [Rosetta Code](https://www.rosettacode.org/wiki/Roman_numerals/Decode#Swift).

The coverage has been expanded to measure performance of `String`/`Substring`/`UTF8View` with very short string arguments and methods: `hasPrefix`/`starts(with:)`, `removeFirst`/`dropFirst` and `String.append()`, as well as functional variants of the fastest imperative version.

The `Roman.Substring.startsWith.dropFirst` variant tests the same code paths as the original `RomanNumbers` benchmark, but the name is changed because of the bug-fix and lowered workload (to run in less than 1000 μs).

For comparison, there's one extra variant with character based parsing algorithm: `Roman.DictCharInt.map.reduce`.

rudkx/swift,amraboelela/swift,benlangmuir/swift,CodaFi/swift,aschwaighofer/swift,airspeedswift/swift,stephentyrone/swift,ahoppen/swift,harlanhaskins/swift,shahmishal/swift,nathawes/swift,gribozavr/swift,xedin/swift,shajrawi/swift,stephentyrone/swift,devincoughlin/swift,benlangmuir/swift,practicalswift/swift,devincoughlin/swift,parkera/swift,practicalswift/swift,ahoppen/swift,parkera/swift,CodaFi/swift,jmgc/swift,shahmishal/swift,aschwaighofer/swift,airspeedswift/swift,allevato/swift,hooman/swift,benlangmuir/swift,glessard/swift,harlanhaskins/swift,sschiau/swift,tkremenek/swift,devincoughlin/swift,jckarter/swift,sschiau/swift,ahoppen/swift,shajrawi/swift,lorentey/swift,nathawes/swift,shahmishal/swift,hooman/swift,gregomni/swift,parkera/swift,benlangmuir/swift,JGiola/swift,benlangmuir/swift,xwu/swift,gribozavr/swift,jckarter/swift,nathawes/swift,xwu/swift,practicalswift/swift,karwa/swift,shahmishal/swift,karwa/swift,jmgc/swift,lorentey/swift,shajrawi/swift,hooman/swift,tkremenek/swift,jckarter/swift,allevato/swift,JGiola/swift,hooman/swift,jmgc/swift,amraboelela/swift,shajrawi/swift,airspeedswift/swift,allevato/swift,airspeedswift/swift,xwu/swift,devincoughlin/swift,practicalswift/swift,stephentyrone/swift,xedin/swift,karwa/swift,karwa/swift,JGiola/swift,amraboelela/swift,gribozavr/swift,glessard/swift,allevato/swift,aschwaighofer/swift,shahmishal/swift,nathawes/swift,jckarter/swift,xedin/swift,devincoughlin/swift,shajrawi/swift,apple/swift,CodaFi/swift,roambotics/swift,apple/swift,parkera/swift,CodaFi/swift,roambotics/swift,xedin/swift,ahoppen/swift,practicalswift/swift,roambotics/swift,amraboelela/swift,jmgc/swift,sschiau/swift,devincoughlin/swift,rudkx/swift,gregomni/swift,rudkx/swift,xedin/swift,lorentey/swift,atrick/swift,gribozavr/swift,xedin/swift,gregomni/swift,sschiau/swift,stephentyrone/swift,parkera/swift,nathawes/swift,ahoppen/swift,jmgc/swift,allevato/swift,roambotics/swift,hooman/swift,gregomni/swift,sschiau/swift,xedin/swift,shajrawi/swift,harlanhaskins/swift,jmgc/swift,tkremenek/swift,nathawes/swift,harlanhaskins/swift,lorentey/swift,hooman/swift,apple/swift,roambotics/swift,roambotics/swift,sschiau/swift,airspeedswift/swift,practicalswift/swift,airspeedswift/swift,jckarter/swift,CodaFi/swift,tkremenek/swift,karwa/swift,sschiau/swift,devincoughlin/swift,glessard/swift,atrick/swift,stephentyrone/swift,gribozavr/swift,xwu/swift,aschwaighofer/swift,harlanhaskins/swift,jckarter/swift,glessard/swift,karwa/swift,ahoppen/swift,gregomni/swift,xwu/swift,allevato/swift,xwu/swift,lorentey/swift,gribozavr/swift,allevato/swift,practicalswift/swift,shahmishal/swift,apple/swift,JGiola/swift,xwu/swift,tkremenek/swift,atrick/swift,aschwaighofer/swift,airspeedswift/swift,jckarter/swift,parkera/swift,atrick/swift,gregomni/swift,benlangmuir/swift,aschwaighofer/swift,JGiola/swift,rudkx/swift,lorentey/swift,parkera/swift,karwa/swift,hooman/swift,shajrawi/swift,glessard/swift,xedin/swift,tkremenek/swift,harlanhaskins/swift,shahmishal/swift,gribozavr/swift,stephentyrone/swift,shajrawi/swift,gribozavr/swift,apple/swift,stephentyrone/swift,amraboelela/swift,apple/swift,amraboelela/swift,tkremenek/swift,CodaFi/swift,rudkx/swift,amraboelela/swift,jmgc/swift,sschiau/swift,nathawes/swift,harlanhaskins/swift,glessard/swift,atrick/swift,atrick/swift,aschwaighofer/swift,rudkx/swift,lorentey/swift,CodaFi/swift,lorentey/swift,karwa/swift,practicalswift/swift,parkera/swift,JGiola/swift,shahmishal/swift,devincoughlin/swift