Performance optimization

[ycherkes]

I created a fork Raffinert.FuzzySharp. Someone who'd like to try this can use this Raffinert.FuzzySharp NuGet until this PR is merged.

Accent to performance and allocations. See Benchmark.
Support local languages more naturally (removed regexps "a-zA-Z"). All regexps were replaced with string manipulations (fixes PR!7).
Extra performance improvement, reused approach Dmitry Sushchevsky - see PR!42.
Implemented new Process.ExtractAll method, see Issue!46.
Remove support of outdated/vulnerable platforms netcoreapp2.0;netcoreapp2.1;netstandard1.6.

Before:

BenchmarkDotNet v0.14.0, Windows 11 (10.0.22631.3880/23H2/2023Update/SunValley3)
12th Gen Intel Core i7-1255U, 1 CPU, 12 logical and 10 physical cores
.NET SDK 8.0.303
[Host] : .NET 8.0.7 (8.0.724.31311), X64 RyuJIT AVX2
DefaultJob : .NET 8.0.7 (8.0.724.31311), X64 RyuJIT AVX2

Method	Mean	Error	StdDev	Gen0	Gen1	Allocated
Ratio1	269.77 ns	3.168 ns	2.809 ns	0.0505	-	320 B
Ratio2	44.11 ns	0.880 ns	0.903 ns	0.0318	-	200 B
PartialRatio	944.78 ns	18.218 ns	24.321 ns	0.5360	0.0019	3368 B
TokenSortRatio	1,508.79 ns	29.616 ns	30.414 ns	0.3529	-	2216 B
PartialTokenSortRatio	1,567.89 ns	30.935 ns	42.344 ns	0.4025	-	2536 B
TokenSetRatio	2,148.36 ns	42.070 ns	57.587 ns	0.6905	-	4352 B
PartialTokenSetRatio	2,498.55 ns	49.063 ns	73.435 ns	0.9308	-	5840 B
WeightedRatio	11,749.26 ns	168.137 ns	149.049 ns	2.1362	-	13482 B
TokenInitialismRatio1	454.24 ns	8.549 ns	9.845 ns	0.1440	-	904 B
TokenInitialismRatio2	372.71 ns	7.457 ns	12.459 ns	0.1173	-	736 B
TokenInitialismRatio3	858.16 ns	13.069 ns	10.913 ns	0.2470	-	1552 B
PartialTokenInitialismRatio	977.08 ns	6.698 ns	5.938 ns	0.3414	-	2144 B
TokenAbbreviationRatio	1,353.48 ns	8.884 ns	7.875 ns	0.4749	-	2984 B
PartialTokenAbbreviationRatio	1,612.71 ns	32.207 ns	30.127 ns	0.6199	-	3896 B

After:

Method	Mean	Error	StdDev	Gen0	Gen1	Allocated
Ratio1	246.82 ns	3.234 ns	3.025 ns	0.0162	-	104 B
Ratio2	16.02 ns	0.344 ns	0.436 ns	-	-	-
PartialRatio	849.31 ns	13.055 ns	11.573 ns	0.3786	0.0010	2376 B
TokenSortRatio	651.52 ns	12.939 ns	25.237 ns	0.0896	-	568 B
PartialTokenSortRatio	676.59 ns	13.339 ns	13.698 ns	0.1154	-	728 B
TokenSetRatio	856.94 ns	16.701 ns	27.440 ns	0.3490	-	2200 B
PartialTokenSetRatio	1,127.99 ns	21.898 ns	30.698 ns	0.5112	-	3208 B
WeightedRatio	7,065.62 ns	141.109 ns	131.994 ns	0.8011	-	5072 B
TokenInitialismRatio1	145.67 ns	2.918 ns	3.243 ns	0.0625	-	392 B
TokenInitialismRatio2	127.54 ns	2.549 ns	4.531 ns	0.0548	-	344 B
TokenInitialismRatio3	260.34 ns	5.023 ns	7.203 ns	0.1106	-	696 B
PartialTokenInitialismRatio	352.64 ns	6.229 ns	6.923 ns	0.1845	-	1160 B
TokenAbbreviationRatio	624.04 ns	12.404 ns	17.789 ns	0.2508	-	1576 B
PartialTokenAbbreviationRatio	794.29 ns	13.812 ns	12.244 ns	0.3366	-	2112 B