Add function H5FD__s3comms_load_aws_creds_from_file() to get AWS #107

Job	Run time
Autotools Parallel Special Workflows / gcc DBG parallel -Werror (build only)	3m 54s
Autotools Parallel Workflows / Parallel GCC-debug	4m 18s
Autotools Parallel Special Workflows / gcc REL parallel -Werror (build only)	4m 29s
Autotools Special Workflows / gcc DBG v1.10 default API (build only)	5m 2s
Autotools Special Workflows / gcc DBG v1.6 default API (build only)	5m 28s
Autotools Special Workflows / gcc DBG v1.8 default API (build only)	5m 7s
Autotools Special Workflows / gcc DBG -Werror (build only)	4m 30s
Autotools Parallel Workflows / Parallel GCC-production	5m 6s
Autotools Special Workflows / gcc no deprecated symbols (build only)	5m 22s
Autotools Special Workflows / gcc REL -Werror (build only)	5m 36s
Autotools Special Workflows / gcc DBG v1.14 default API (build only)	4m 54s
Autotools Special Workflows / gcc DBG v1.12 default API (build only)	5m 22s
Autotools Debug Workflows / GCC-debug-TS=disabled	12m 52s
Autotools Debug Thread-Safety Workflows / GCC-debug-TS=enabled	4m 23s
Autotools aocc Workflows / aocc production	34m 51s
Autotools Intel Workflows / linux-oneapi production	13m 42s
Autotools nvhpc Workflows / nvhpc production	19m 41s
Autotools Release Workflows / GCC-production-TS=disabled	13m 0s
Autotools TestExpress Workflows / Autotools production Express Test Workflows	12m 59s
Autotools Release Thread-Safety Workflows / GCC-production-TS=enabled	5m 16s
Autotools TestExpress Workflows / Autotools debug Express Test Workflows	14m 24s
	3h 10m 16s

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