Respect ignoreCase flag in CommonGramsFilterFactory #541

Job	Run time
Test (windows-latest, net8.0, x64, Release)	2m 29s
Test (windows-latest, net8.0, x64, Release)	2m 29s
Test (windows-latest, net5.0, x64, Release)	20s
Test (windows-latest, net5.0, x64, Release)	2m 49s
Test (windows-latest, net48, x64, Release)	20s
Test (windows-latest, net48, x64, Release)	2m 53s
Test (windows-latest, net472, x64, Release)	2m 23s
Test (windows-latest, net472, x64, Release)	2m 23s
Test (ubuntu-22.04, net8.0, x64, Release)	55s
Test (ubuntu-22.04, net8.0, x64, Release)	55s
Test (ubuntu-22.04, net5.0, x64, Release)	53s
Test (ubuntu-22.04, net5.0, x64, Release)	53s
	19m 42s

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