Make panel and panel.io lazy imports #12183

Job	Run time
Pixi lock	5s
Setup workflow	5s
Run pre-commit	31s
type:test-type:ubuntu-latest	47s
core:test-core:ubuntu-latest	3m 52s
ui:test-ui:ubuntu-latest	1m 5s
core:test-minimum:ubuntu-latest	53s
unit:test-310:ubuntu-latest	1m 27s
ui:test-ui:macos-latest	2m 14s
ui:test-ui:windows-latest	5m 34s
unit:test-312:ubuntu-latest	1m 19s
unit:test-310:macos-latest	1m 28s
unit:test-312:macos-latest	1m 58s
unit:test-310:windows-latest	7m 6s
unit:test-312:windows-latest	4m 27s
result:test	1s
	32m 52s

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