Add Edc Sample for testing

.idea/.gitignore

.idea/gradle.xml

.idea/misc.xml

.idea/uiDesigner.xml

.idea/vcs.xml

sample/transfer/README.md

sample/transfer/transfer-01-file-transfer/README.md

sample/transfer/transfer-01-file-transfer/contractoffer.json

...-01-file-transfer/file-transfer-consumer/build.gradle.kts

...01-file-transfer/file-transfer-consumer/config.properties

...-01-file-transfer/file-transfer-provider/build.gradle.kts

...01-file-transfer/file-transfer-provider/config.properties

sample/transfer/transfer-01-file-transfer/filetransfer.json

...transfer-01-file-transfer/status-checker/build.gradle.kts

...edc/sample/extension/checker/SampleFileStatusChecker.java

...ample/extension/checker/SampleStatusCheckerExtension.java

...-INF/services/org.eclipse.edc.spi.system.ServiceExtension

...fer-01-file-transfer/transfer-file-local/build.gradle.kts

...clipse/edc/sample/extension/api/FileTransferDataSink.java

...edc/sample/extension/api/FileTransferDataSinkFactory.java