Context Navigation

Changes between Initial Version and Version 1 of Ticket #37416, comment 6

initial	v1
9	9
10	10	I wouldn't want to recommend using CONCURRENTLY routinely because it can "fail but leave behind an “invalid” index. This index will be ignored for querying purposes because it might be incomplete; however it will still consume update overhead."
	11
	12	The actual thing that's frustrating me here is that schema_editor opens its own atomic block, instead of having the caller wrap it if desired. I think this is required for some sqlite weirdness, but it'd be a lot more elegant if they were decoupled.