Add Positron Variables Pane Methods #1315

Job	Run time
OS=macOS-latest R=release py=3.11	3m 15s
OS=windows-latest R=release py=3.11	8m 49s
OS=ubuntu-latest R=release py=3.11	4m 8s
OS=macOS-latest R=oldrel py=3.11	3m 53s
OS=ubuntu-latest R=oldrel-1 py=3.10	4m 49s
OS=ubuntu-latest R=oldrel-2 py=3.10	4m 44s
OS=ubuntu-20.04 R=oldrel-3 py=3.9	5m 13s
OS=ubuntu-20.04 R=oldrel-4 py=3.9	5m 19s
OS=ubuntu-latest R=release py=3.8	4m 52s
OS=ubuntu-latest R=release py=3.9	4m 27s
OS=ubuntu-latest R=release py=3.11	4m 36s
OS=ubuntu-latest R=release py=3.12	4m 23s
OS=ubuntu-latest R=release py=3.13	4m 26s
OS=ubuntu-latest R=devel py=3.13	4m 44s
	1h 7m 38s

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