add Redis cache and some clean up

- update and cleanup in README.md
- update getIdentity to throw response exception with 401 in JwtService
- update http files to use identity from env
- add cacheable to getIdentityFromDevice in DeviceRegistryService
- add RedisCacheConfiguration
- add CacheProperty
- set up cache property
- set up data redis cache

http/configuration.http

@@ -1,3 +1,3 @@
-### get measurement
+### get configuration
 GET {{hostname}}/configuration
-Identity: 0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ.0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ.0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ
+Identity: {{identity}}