Sliding Sync: Add E2EE extension (MSC3884) #2341

Job	Run time
changes	4s
lint-crlf	4s
check-lockfile	4s
lint-newsfile	32s
Typechecking	1m 35s
lint	54s
check-sampleconfig	45s
check-schema-delta	57s
lint-pydantic	1m 1s
lint-clippy	0s
lint-clippy-nightly	0s
lint-readme	0s
lint-rustfmt	0s
linting-done	3s
calculate-test-jobs	7s
trial-olddeps	7m 51s
complement (monolith, SQLite)	12m 35s
portdb (3.8, 11)	2m 53s
trial-pypy	0s
complement (monolith, Postgres)	13m 11s
portdb (3.11, 15)	2m 51s
complement (workers, Postgres)	20m 34s
cargo-test	0s
cargo-bench	0s
trial (3.8, sqlite, all)	5m 4s
sytest (focal)	8m 35s
trial (3.8, postgres, 11, all)	11m 58s
sytest (focal, postgres)	10m 23s
sytest (focal, multi-postgres, workers)	13m 34s
trial (3.8, sqlite)	4m 43s
sytest (focal, multi-postgres, workers, asyncio)	19m 42s
export-data	2m 11s
tests-done	4s
	2h 22m 15s

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