Add experimental Server Card extension support (SEP-2127) #3820

Job	Run time
checks / docs	58s
checks / pre-commit	50s
checks / readme-snippets	15s
checks / test (3.10, lowest-direct, windows-latest)	2m 3s
checks / test (3.11, lowest-direct, ubuntu-latest)	1m 28s
checks / test (3.11, lowest-direct, windows-latest)	2m 16s
checks / test (3.10, locked, windows-latest)	2m 30s
checks / test (3.10, locked, ubuntu-latest)	1m 33s
checks / test (3.10, lowest-direct, ubuntu-latest)	1m 16s
checks / test (3.14, lowest-direct, windows-latest)	1m 48s
checks / test (3.12, lowest-direct, windows-latest)	2m 9s
checks / test (3.11, locked, ubuntu-latest)	1m 5s
checks / test (3.12, locked, windows-latest)	2m 14s
checks / test (3.13, lowest-direct, ubuntu-latest)	1m 27s
checks / test (3.13, locked, windows-latest)	1m 37s
checks / test (3.12, lowest-direct, ubuntu-latest)	1m 21s
checks / test (3.12, locked, ubuntu-latest)	1m 40s
checks / test (3.13, lowest-direct, windows-latest)	1m 55s
checks / test (3.11, locked, windows-latest)	2m 0s
checks / test (3.14, locked, ubuntu-latest)	1m 20s
checks / test (3.14, locked, windows-latest)	2m 5s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 23s
checks / test (3.13, locked, ubuntu-latest)	1m 18s
all-green	6s
	36m 37s

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