Add Positron Variables Pane Methods #1320

Job	Run time
OS=macOS-latest R=release py=3.11	3m 31s
OS=windows-latest R=release py=3.11	10m 19s
OS=ubuntu-latest R=release py=3.11	4m 33s
OS=macOS-latest R=oldrel py=3.11	4m 27s
OS=ubuntu-latest R=oldrel-1 py=3.10	4m 14s
OS=ubuntu-latest R=oldrel-2 py=3.10	4m 32s
OS=ubuntu-20.04 R=oldrel-3 py=3.9	5m 9s
OS=ubuntu-20.04 R=oldrel-4 py=3.9	4m 34s
OS=ubuntu-latest R=release py=3.8	4m 42s
OS=ubuntu-latest R=release py=3.9	4m 44s
OS=ubuntu-latest R=release py=3.11	4m 31s
OS=ubuntu-latest R=release py=3.12	4m 49s
OS=ubuntu-latest R=release py=3.13	4m 58s
OS=ubuntu-latest R=devel py=3.13	4m 55s
	1h 9m 58s

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