Send "Hello" message on connect

[cpr-mab]

To improve troubleshooting the "Hello" message should be sent on connect. It contains the client's name, version number and system time, which the robot control writes to its log file. This makes it clear, when reading the logs, which client has connected at what time.

Currently the "Hello" message is not documented yet:
INFO Hello "<software name>" <software version> <UTC time>
INFO Hello \"My Application\" V123-14-005-0 2025-09-29T07:29:26

• The version numbers should be separated by '-' or '.', the time must be the current universal time
• The message must be sent only once on connect
• The Python lib should provide a function to set these values before connect
• If the values are not set, generic values should be used indicating the Python API is used. E.g. software name "Python API", version "0-0-0-0" or the actual version of the API