Logging macros & Log Level refactor

To base the work of the #2277 EPIC, we need to :

• Refactor logging macros and the logger namespace so we have - at least under the hood - a real class,
• the messages should be all equally aligned with the outputting rank (see below),
• Refactor the LogLevel, it should be an enum with clear and documented labels (see below),

Refactored log output exemple :

INFO      : well ‘my well (myxml.xml:123)’ is shut
 RANK 170

===================================================
TIMESTEP  : Time: 0s, dt:864s, Cycle: 0
 RANK     0
===================================================

WARNING   : Time-step required will be increased based on state change.
 RANK 1

LogLevel enum proposal :

/// @brief Enumerate the logging levels from the most importants messages to the one that contain the more details.
enum class LogLevel : int16_t
{
  Silent = -1,    // Useful as a globalLogLevel for silencing the logger. shouldn't be used as a message level.
  Important = 0,  // Application level messages (help, almost blocking warnings, application informations & phases)
  Progress = 1,   // Time step attempts, newton loop progress of Solver objects
  Detailed = 2,   // More detailed info and stats that affect progress, e.g. residual norms.
  Trace = 3,      // This is intended as a user-level debugging tool. detailed info trace what each component is
                  // doing. e.g. a line for every part of the assembly process, every boundary condition that's being
                  // applied by a physics solver, etc.
  Debug = 4,      // Information that are only relevant for a developper in a debugging context.
  DebugTrace = 5, // This level is useful to have deeper debugging information (which can be potencially heavy to log).
};