Add Positron Variables Pane Methods #1314

Job	Run time
OS=macOS-latest R=release py=3.11	3m 13s
OS=windows-latest R=release py=3.11	8m 42s
OS=ubuntu-latest R=release py=3.11	5m 45s
OS=macOS-latest R=oldrel py=3.11	3m 38s
OS=ubuntu-latest R=oldrel-1 py=3.10	5m 38s
OS=ubuntu-latest R=oldrel-2 py=3.10	5m 22s
OS=ubuntu-20.04 R=oldrel-3 py=3.9	6m 14s
OS=ubuntu-20.04 R=oldrel-4 py=3.9	5m 45s
OS=ubuntu-latest R=release py=3.8	4m 58s
OS=ubuntu-latest R=release py=3.9	4m 59s
OS=ubuntu-latest R=release py=3.11	5m 1s
OS=ubuntu-latest R=release py=3.12	5m 12s
OS=ubuntu-latest R=release py=3.13	5m 55s
OS=ubuntu-latest R=devel py=3.13	10m 43s
	1h 21m 5s

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