Add support for context-only resources (#1405) #3625

Job	Run time
checks / pre-commit	28s
checks / readme-snippets	12s
checks / test (3.11, lowest-direct, ubuntu-latest)	44s
checks / test (3.10, highest, windows-latest)	2m 15s
checks / test (3.10, lowest-direct, windows-latest)	1m 59s
checks / test (3.10, highest, ubuntu-latest)	44s
checks / test (3.10, lowest-direct, ubuntu-latest)	42s
checks / test (3.11, highest, ubuntu-latest)	44s
checks / test (3.13, lowest-direct, windows-latest)	2m 27s
checks / test (3.12, highest, ubuntu-latest)	48s
checks / test (3.13, highest, ubuntu-latest)	41s
checks / test (3.12, lowest-direct, ubuntu-latest)	46s
checks / test (3.12, lowest-direct, windows-latest)	3m 29s
checks / test (3.13, lowest-direct, ubuntu-latest)	40s
checks / test (3.11, highest, windows-latest)	2m 4s
checks / test (3.13, highest, windows-latest)	2m 11s
checks / test (3.12, highest, windows-latest)	2m 52s
checks / test (3.11, lowest-direct, windows-latest)	1m 57s
	25m 43s

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