Add Positron Variables Pane Methods #1326

Job	Run time
OS=macOS-latest R=release py=3.11	4m 44s
OS=windows-latest R=release py=3.11	10m 10s
OS=ubuntu-latest R=release py=3.11	4m 9s
OS=macOS-latest R=oldrel py=3.11	3m 44s
OS=ubuntu-latest R=oldrel-1 py=3.10	4m 22s
OS=ubuntu-latest R=oldrel-2 py=3.10	4m 53s
OS=ubuntu-20.04 R=oldrel-3 py=3.9	5m 50s
OS=ubuntu-20.04 R=oldrel-4 py=3.9	5m 1s
OS=ubuntu-latest R=release py=3.8	6m 27s
OS=ubuntu-latest R=release py=3.9	4m 54s
OS=ubuntu-latest R=release py=3.11	4m 15s
OS=ubuntu-latest R=release py=3.12	4m 27s
OS=ubuntu-latest R=release py=3.13	4m 28s
OS=ubuntu-latest R=devel py=3.13	4m 46s
	1h 12m 10s

Provide feedback