Add floattype support

[NicoKiaru]

java.lang.UnsupportedOperationException: Unhandled pixel type class: net.imglib2.type.numeric.real.FloatType
at ch.epfl.biop.kheops.ometiff.OMETiffExporter$OMETiffExporterBuilder$Data$DataBuilder.validate(OMETiffExporter.java:881)
at ch.epfl.biop.kheops.ometiff.OMETiffExporter$OMETiffExporterBuilder$Data$DataBuilder.putXYZRAI(OMETiffExporter.java:816)
at ch.epfl.biop.kheops.ometiff.OMETiffExporter$OMETiffExporterBuilder$Data$DataBuilder.put(OMETiffExporter.java:743)
at ch.epfl.biop.kheops.ometiff.OMETiffExporter$OMETiffExporterBuilder$Data$DataBuilder.put(OMETiffExporter.java:785)
at ch.epfl.biop.kheops.ometiff.OMETiffExporter$OMETiffExporterBuilder$Data$DataBuilder.put(OMETiffExporter.java:771)
at ch.epfl.biop.kheops.command.KheopsExportSourcesCommand.run(KheopsExportSourcesCommand.java:135)
at org.scijava.command.CommandModule.run(CommandModule.java:196)
at org.scijava.module.ModuleRunner.run(ModuleRunner.java:165)
at org.scijava.module.ModuleRunner.call(ModuleRunner.java:125)
at org.scijava.module.ModuleRunner.call(ModuleRunner.java:64)
at org.scijava.thread.DefaultThreadService.lambda$wrap$2(DefaultThreadService.java:247)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:750)