Change SessionId to uuid-like format

[hjoaquim]

^

Benefit of having the SessionId as a UUID instead of the UNIX timestamp: avoid having users with the same UserId/AppId with the same SessionId - this would happen in the case of the user launching two terminal instances exactly at the same time.

Side effect: log files names change from gst_1678795847.2023-03-14_12.log to gst_5b698cdc-4d4d-4b2f-983a-2660cba0ea97-1678795471.2023-03-14_12.log - this comes with no other consequences, since for the logging etl we're filtering those files using LastModified S3 param.

Decided to add a time based component in the get_session_id function to double ensure uniqueness.

[codecov]

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