Merge branch 'logparser_docu' into 'main'

docs/examples/howto_logparser/plot_logparser_advanced.py

docs/examples/howto_logparser/plot_logparser_analyses.py

docs/examples/howto_logparser/plot_logparser_intro.py

ogstools/logparser/common_ogs_analyses.py

ogstools/logparser/examples/__init__.py

ogstools/logparser/examples/parallel_1_info.txt

ogstools/logparser/examples/parallel_3_debug.txt

ogstools/logparser/examples/serial_convergence_long.txt

ogstools/logparser/examples/serial_convergence_short.txt

ogstools/logparser/examples/serial_critical.txt

ogstools/logparser/examples/serial_info.txt

ogstools/logparser/examples/serial_time_step_rejected.txt

ogstools/logparser/examples/serial_warning_only.txt

tests/test_logparser.py