Add timestamp in stdout logs

[tbittar]

In order to improve the monitoring of Xpansion progress within AntaresWeb, we want to add 3 information before each bloc of log that is printed :

• Xpansion step (among Pre Antares, Antares, Problem Generation, Benders, Study Update)
• Timestamp (in the format as Simulator), in UTC time
• Type of the logs (info, warning, ....). Normally error logs are already redirected to stderr

An example of the logs could be :

[Pre Antares][<Info> 05-05-2023 11:06:36] Running Antares Xpansion ... 
[Pre Antares][<Info> 05-05-2023 11:06:36] user: xxx
[Pre Antares][<Info> 05-05-2023 11:06:36] hostname: xxx
[Pre Antares][<Info> 05-05-2023 11:06:36] Xpansion version: 1.1.0
[Pre Antares][<Info> 05-05-2023 11:06:36] antares simulator version: 8.5.0
----------------------------------------------------------------
[Pre Antares][<Info> 05-05-2023 11:06:36] /my_study_directory is locked
[Pre Antares][<Info> 05-05-2023 11:06:36] -- pre antares
[Antares][<Info> 05-05-2023 11:06:36] -- launching antares
[Antares][<Info> 05-05-2023 11:06:36] Antares simulation duration : 0:00:03.759935
[Antares][<Info> 05-05-2023 11:06:36] -- post antares
[Antares][<Info> 05-05-2023 11:06:36] Current directory is now:  /my_study_directory/output/20230505-1106eco-Xpansion/lp
[Problem Generation][<Info> 05-05-2023 11:06:36] Launching Problem Generation
[Problem Generation[<Info> 05-05-2023 11:06:42] Problem Generation ran in: 5 seconds 
 ________________________________________________________________________
/
[Benders][<Info> 05-05-2023 11:06:36]	Solving master...
[Benders][<Info> 05-05-2023 11:06:36]	Master solved in 0.0222537 s
[Benders][<Info> 05-05-2023 11:06:36] ITERATION 1:
		                                        Candidates:
			                                                  battery = 0.00 invested MW -- possible interval [0.00; 1000.00] MW
			                                                     peak = 0.00 invested MW -- possible interval [0.00; 2000.00] MW
			                                                       pv = 0.00 invested MW -- possible interval [0.00; 1000.00] MW
			                                                 semibase = 0.00 invested MW -- possible interval [0.00; 2000.00] MW
			                                        transmission_line = 0.00 invested MW -- possible interval [0.00; 3200.00] MW
	                                        cumulative number of subproblem resolutions: 156
	                                        Subproblems solved in (cumulative cpu): 1.31792 s
	                                        Subproblems solved in (walltime): 0.15311 s

The format in the example is just a suggestion, any format that displays the required info suits the needs.