DEN-12183 KBM: Credentials messaging
- Added Credential messages
| 2003 | req save credential |1639391827,1,0,2003,3,path_to_client_certificate_pem,path_to_client_private_key_pem,path_to_client_public_key_pem |
| 2004 | req credentials | 1639391827,1,0,2004,0 |
| 1004 | send credentials | 1639391827,1,0,1004,1,path_to_credentials="/tmp/credentials" |