Add experimental Server Card extension support (SEP-2127) #3551

Job	Run time
checks / readme-snippets	11s
checks / docs	1m 4s
checks / pre-commit	51s
checks / test (3.11, locked, ubuntu-latest)	1m 24s
checks / test (3.12, lowest-direct, ubuntu-latest)	1m 12s
checks / test (3.11, locked, windows-latest)	1m 52s
checks / test (3.10, lowest-direct, ubuntu-latest)	1m 27s
checks / test (3.10, locked, ubuntu-latest)	1m 22s
checks / test (3.11, lowest-direct, ubuntu-latest)	1m 21s
checks / test (3.11, lowest-direct, windows-latest)	1m 51s
checks / test (3.10, locked, windows-latest)	1m 51s
checks / test (3.13, lowest-direct, windows-latest)	1m 59s
checks / test (3.13, locked, ubuntu-latest)	1m 16s
checks / test (3.10, lowest-direct, windows-latest)	1m 57s
checks / test (3.12, locked, windows-latest)	1m 59s
checks / test (3.12, locked, ubuntu-latest)	1m 37s
checks / test (3.13, lowest-direct, ubuntu-latest)	1m 19s
checks / test (3.14, locked, windows-latest)	2m 5s
checks / test (3.14, lowest-direct, ubuntu-latest)	1m 18s
checks / test (3.13, locked, windows-latest)	1m 57s
checks / test (3.14, lowest-direct, windows-latest)	1m 50s
checks / test (3.14, locked, ubuntu-latest)	1m 20s
checks / test (3.12, lowest-direct, windows-latest)	2m 2s
all-green	2s
	35m 7s

Provide feedback