Include MPI process rank in exception log messages

[yousefmoazzam]

Currently, the exception-logging function only logs the message:

httomo/httomo/utils.py

Lines 76 to 85 in 8ccf663

	def log_exception(output: str) -> None:
	"""
	Log an exception to the log file.
	Parameters
	----------
	output : str
	The exception to be logged.
	"""
	logger.error(output)

but adding in the rank of the process could be useful for debugging purposes in some situations, as the log_rank() function does:

httomo/httomo/utils.py

Lines 62 to 73 in 8ccf663

	def log_rank(output: Any, comm: MPI.Comm) -> None:
	"""
	Log output to log file with the process rank.
	Parameters
	----------
	output : Any
	The item to be printed.
	comm : Comm
	The comm used to determine the process rank.
	"""
	logger.debug(f"RANK: [{comm.rank}], {output}")