Add explicit error message when trying to apply a non existing file

[Damien-Fayet]

Problem

When trying to apply a file that does not exists, we have the whole java stack trace as a result.

Suggestion

Perhaps, we can replace it by an explicit and easy to understand message.

Additional Context

kafkactl apply -f myfile
java.lang.RuntimeException: java.nio.file.NoSuchFileException: myfile
	at com.michelin.kafkactl.service.FileService.lambda$parseResourceListFromFiles$0(FileService.java:46)
	at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:197)
	at java.base/java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:197)
	at java.base/java.util.AbstractList$RandomAccessSpliterator.forEachRemaining(AbstractList.java:722)
	at java.base/java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:509)
	at java.base/java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:499)
	at java.base/java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:575)
	at java.base/java.util.stream.AbstractPipeline.evaluateToArrayNode(AbstractPipeline.java:260)
	at java.base/java.util.stream.ReferencePipeline.toArray(ReferencePipeline.java:616)
	at java.base/java.util.stream.ReferencePipeline.toArray(ReferencePipeline.java:622)
	at java.base/java.util.stream.ReferencePipeline.toList(ReferencePipeline.java:627)
	at com.michelin.kafkactl.service.FileService.parseResourceListFromFiles(FileService.java:50)
	at com.michelin.kafkactl.service.ResourceService.parseResources(ResourceService.java:443)
	at com.michelin.kafkactl.command.Apply.onAuthSuccess(Apply.java:60)
	at com.michelin.kafkactl.hook.AuthenticatedHook.onContextValid(AuthenticatedHook.java:47)
	at com.michelin.kafkactl.hook.DryRunHook.onContextValid(DryRunHook.java:21)
	at com.michelin.kafkactl.hook.ValidCurrentContextHook.call(ValidCurrentContextHook.java:37)
	at com.michelin.kafkactl.hook.ValidCurrentContextHook.call(ValidCurrentContextHook.java:18)
	at picocli.CommandLine.executeUserObject(CommandLine.java:2041)
	at picocli.CommandLine.access$1500(CommandLine.java:148)
	at picocli.CommandLine$RunLast.executeUserObjectOfLastSubcommandWithSameParent(CommandLine.java:2461)
	at picocli.CommandLine$RunLast.handle(CommandLine.java:2453)
	at picocli.CommandLine$RunLast.handle(CommandLine.java:2415)
	at picocli.CommandLine$AbstractParseResultHandler.execute(CommandLine.java:2273)
	at picocli.CommandLine$RunLast.execute(CommandLine.java:2417)
	at picocli.CommandLine.execute(CommandLine.java:2170)
	at io.micronaut.configuration.picocli.PicocliRunner.execute(PicocliRunner.java:226)
	at io.micronaut.configuration.picocli.PicocliRunner.execute(PicocliRunner.java:188)
	at com.michelin.kafkactl.Kafkactl.main(Kafkactl.java:82)
Caused by: java.nio.file.NoSuchFileException: myfile
	at java.base/sun.nio.fs.UnixException.translateToIOException(UnixException.java:92)
	at java.base/sun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:106)
	at java.base/sun.nio.fs.UnixException.rethrowAsIOException(UnixException.java:111)
	at java.base/sun.nio.fs.UnixFileSystemProvider.newByteChannel(UnixFileSystemProvider.java:261)
	at java.base/java.nio.file.Files.newByteChannel(Files.java:379)
	at java.base/java.nio.file.Files.newByteChannel(Files.java:431)
	at java.base/java.nio.file.Files.readAllBytes(Files.java:3268)
	at java.base/java.nio.file.Files.readString(Files.java:3346)
	at java.base/java.nio.file.Files.readString(Files.java:3305)
	at com.michelin.kafkactl.service.FileService.lambda$parseResourceListFromFiles$0(FileService.java:43)
	... 28 more

[nil-malh]

@loicgreffier I can take this one if you want :)