Add "Test URL preview" sytest and basic webserver creation #520
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This follows up on #279, specifically this comment.
This re-adds the URL preview test, but also adds a basic framework in
internal/web
for those webservers, with example use being displayed in the re-added test.This PR is related to matrix-org/synapse#14198, which
needs to land first before the test can be un-skippedhad landed.