docs: Adds ADR 11. Course and block data

[pomegranited]

Description

Documents our decision to use an event sink to synchronize course and block data from Open edX to Clickhouse.

Supporting information

Part of #61

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[bmtcril]

Looks good once these warnings get fixed:

• /home/docs/checkouts/readthedocs.org/user_builds/openedx-oars/checkouts/109/docs/decisions/0011_course_block_data.rst:36: ERROR: Unknown target name: "oep-50 hooks extension framework".
• /home/docs/checkouts/readthedocs.org/user_builds/openedx-oars/checkouts/109/docs/decisions/0011_course_block_data.rst:55: ERROR: Unknown target name: "coursegraph".

I think we'll probably supersede this with one that uses the event bus instead of event sink eventually, but I don't think we need to speculate on that here. I was going to comment that we have some more general usages than just these, but I think you captured that at the end. 👍

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