Add experimental Server Card extension support (SEP-2127) #3819

Job	Run time
checks / docs	55s
checks / readme-snippets	11s
checks / pre-commit	51s
checks / test (3.12, lowest-direct, ubuntu-latest)	1m 18s
checks / test (3.12, lowest-direct, windows-latest)	1m 51s
checks / test (3.10, lowest-direct, ubuntu-latest)	1m 14s
checks / test (3.10, locked, windows-latest)	1m 56s
checks / test (3.10, lowest-direct, windows-latest)	1m 33s
checks / test (3.11, lowest-direct, windows-latest)	1m 43s
checks / test (3.11, locked, ubuntu-latest)	1m 15s
checks / test (3.10, locked, ubuntu-latest)	52s
checks / test (3.11, locked, windows-latest)	1m 42s
checks / test (3.12, locked, ubuntu-latest)	1m 24s
checks / test (3.11, lowest-direct, ubuntu-latest)	48s
checks / test (3.13, locked, ubuntu-latest)	1m 4s
checks / test (3.12, locked, windows-latest)	1m 50s
checks / test (3.14, locked, ubuntu-latest)	1m 9s
checks / test (3.14, locked, windows-latest)	1m 41s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 10s
checks / test (3.13, lowest-direct, ubuntu-latest)	1m 8s
checks / test (3.13, lowest-direct, windows-latest)	1m 53s
checks / test (3.13, locked, windows-latest)	1m 55s
checks / test (3.14, lowest-direct, windows-latest)	1m 38s
all-green	4s
	31m 5s

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