[deutschebahn] Initial contribution: New binding for DeutscheBahn Fahrplan (#11384)

* Created binding for DeutscheBahn Timetable API.

Signed-off-by: Sönke Küper <soenkekueper@gmx.de>

* Disabled schema validation and used original schema. Added tests for hannover hbf which has non schema conforming responses.

Signed-off-by: Sönke Küper <soenkekueper@gmx.de>

* Added information about UNDEF and NULL channel values.

Signed-off-by: Sönke Küper <soenkekueper@gmx.de>

* Added sample widget and screenshot

Signed-off-by: Sönke Küper <soenkekueper@gmx.de>

* Filtering duplicate messages

Signed-off-by: Sönke Küper <soenkekueper@gmx.de>

* Fixed some typos.

Signed-off-by: Sönke Küper <soenkekueper@gmx.de>

* Updated to jUnit5

Signed-off-by: Sönke Küper <soenkekueper@gmx.de>

* Applied review remarks in Readme

Signed-off-by: Sönke Küper <soenkekueper@gmx.de>

* Applied some review remarks

Signed-off-by: Sönke Küper <soenkekueper@gmx.de>

* 0000: Fixed compile warnings

Signed-off-by: Sönke Küper <soenkekueper@gmx.de>

Co-authored-by: Sönke Küper <soenkekueper@gmx.de>

bom/openhab-addons/pom.xml

@@ -311,6 +311,11 @@
       <artifactId>org.openhab.binding.denonmarantz</artifactId>
       <version>${project.version}</version>
     </dependency>
+    <dependency>
+      <groupId>org.openhab.addons.bundles</groupId>
+      <artifactId>org.openhab.binding.deutschebahn</artifactId>
+      <version>${project.version}</version>
+    </dependency>
     <dependency>
       <groupId>org.openhab.addons.bundles</groupId>
       <artifactId>org.openhab.binding.digiplex</artifactId>