Improve error message for missing extension.

If we get ENOENT while trying to read an extension control file,
report that as a missing extension (with a HINT to install it)
rather than as a filesystem access problem.  The message wording
was extensively bikeshedded in hopes of pointing people to the
idea that they need to do a software installation before they
can install the extension into the current database.

Nathan Bossart, with review/wording suggestions from Daniel
Gustafsson, Chapman Flack, and myself

Discussion: https://postgr.es/m/3950d56a-4e47-48e7-bf9b-f5f22e268...@amazon.com

Branch
------
master

Details
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https://git.postgresql.org/pg/commitdiff/6f6943fc94ada145c0af5f62f719abad73825e5b

Modified Files
--------------
src/backend/commands/extension.c | 19 +++++++++++++++----
1 file changed, 15 insertions(+), 4 deletions(-)

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