Add total and free ram to /system_stats. #184

Job	Run time
test-unix-nightly (macos, 3.11, 12.1, nightly)	9m 0s
test-unix-nightly (linux, 3.11, 12.1, nightly)	5m 57s
test-win-nightly (windows, 3.9, 12.1, nightly)	3m 50s
test-win-nightly (windows, 3.10, 12.1, nightly)	3m 54s
test-win-nightly (windows, 3.11, 12.1, nightly)	3m 54s
test-stable (macos, 3.9, 12.1, stable)	8m 58s
test-stable (macos, 3.10, 12.1, stable)	8m 56s
test-win-nightly (windows, 3.12, 12.1, nightly)	3m 54s
test-stable (macos, 3.11, 12.1, stable)	8m 55s
test-stable (macos, 3.12, 12.1, stable)	8m 52s
test-stable (linux, 3.9, 12.1, stable)	6m 0s
test-stable (linux, 3.10, 12.1, stable)	5m 59s
test-stable (linux, 3.11, 12.1, stable)	6m 0s
test-stable (linux, 3.12, 12.1, stable)	6m 2s
test-stable (windows, 3.9, 12.1, stable)	3m 39s
test-stable (windows, 3.10, 12.1, stable)	3m 45s
test-stable (windows, 3.11, 12.1, stable)	3m 50s
test-stable (windows, 3.12, 12.1, stable)	3m 51s
	1h 45m 16s

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