Switch expression in the GetTokenFromChar method

[viruseg]

Using switch expression in the GetTokenFromChar method slightly improves performance for .NET 8/10.

.NET 10

Method	Mean	Error	StdDev	Ratio
Sort_New	110.3 us	1.00 us	0.88 us	0.95
Sort_Old	115.6 us	0.79 us	0.70 us	1.00

.NET 9

Method	Mean	Error	StdDev	Ratio
Sort_New	125.3 us	0.45 us	0.37 us	1.00
Sort_Old	125.5 us	0.50 us	0.39 us	1.00

.NET 8

Method	Mean	Error	StdDev	Ratio
Sort_New	125.2 us	1.29 us	1.14 us	0.95
Sort_Old	131.4 us	0.71 us	0.59 us	1.00

[codecov]

Codecov Report

❌ Patch coverage is 72.72727% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 94.31%. Comparing base (f514797) to head (36ace72).
⚠️ Report is 2 commits behind head on master.

Files with missing lines	Patch %	Lines
src/NaturalSort.Extension/NaturalSortComparer.cs	72.72%	1 Missing and 2 partials ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #135      +/-   ##
==========================================
+ Coverage   93.54%   94.31%   +0.76%     
==========================================
  Files           2        2              
  Lines          93       88       -5     
  Branches       33       29       -4     
==========================================
- Hits           87       83       -4     
+ Misses          2        1       -1     
  Partials        4        4              

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