Add query parameter `ts` to allow appservices set the `origin_server_ts` for state events. (#11866)

MSC3316 declares that both /rooms/{roomId}/send and /rooms/{roomId}/state
should accept a ts parameter for appservices. This change expands support
to /state and adds tests.

1 files changed, 1 insertions, 0 deletions

diff --git a/changelog.d/11866.feature b/changelog.d/11866.feature
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+Allow application services to set the `origin_server_ts` of a state event by providing the query parameter `ts` in `PUT /_matrix/client/r0/rooms/{roomId}/state/{eventType}/{stateKey}`, per [MSC3316](https://github.com/matrix-org/matrix-doc/pull/3316). Contributed by @lukasdenk.
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