[2.0.0] FS::name() returns the item name as in Arduino SD (#4892)

* FS::name() returns the item name as in Arduino SD

Added method FS::path() that returns the full path

* Adjust examples

libraries/FS/src/FSImpl.h

@@ -38,6 +38,7 @@ public:
     virtual size_t size() const = 0;
     virtual void close() = 0;
     virtual time_t getLastWrite() = 0;
+    virtual const char* path() const = 0;
     virtual const char* name() const = 0;
     virtual boolean isDirectory(void) = 0;
     virtual FileImplPtr openNextFile(const char* mode) = 0;