Use MemorySourceAccessor
in DummyStore
so writes work
#10915
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Motivation
This makes the dummy store a lot more useful. In particular, it opens the door to running complex integration-ish store tests entirely in memory as part of the units tests so we have a reference implementation to hold against other store implementations.
Context
This was originally made for #10874.
Add
read-only
setting todummy://
store for back compat/Priorities and Process
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