feat: extend frontend converter for junction

This is the implementation of frontend converter for junction (from odr open drive junction data to internal junciton) along with tests.

RoadLogicSuite/Internal/Types/BUILD

@@ -170,3 +170,9 @@ cc_library(
         "@units_nhh",
     ],
 )
+
+cc_library(
+    name = "junction",
+    hdrs = ["junction.h"],
+    visibility = ["//RoadLogicSuite:__subpackages__"],
+)