[AT] III. Uwazi-side handler: sending requests

[LaszloKecskes]

Add the Uwazi side handler for MT. Use the redis based TaskManager. See InformationExtraction for a more complicated example. For now:

• the handler should be able to send requests with the proper parameters
• on sending request, should validate that MT is active, and the parameters are correct (same validation as in issue #6950)
• the handler should process messages, but for now, only log them to the console

The request message should be:

namespace: str - <the name of the tenant>
key: list[str] - [<entitySharedId>, <propertyId>]
text: str
language_from: str
languages_to: list[str]