Move connect.h from fe_utils to src/include/common.

Noah Misch <noah@leadboat.com>

Commit: e078fb5d4eeb23d0d09932e0b183a8e7bdfb17b4
Author: Noah Misch <noah@leadboat.com>
Date: 2020-08-10T16:22:54Z
Releases: 14.0
Move connect.h from fe_utils to src/include/common.

Any libpq client can use the header.  Clients include backend components
postgres_fdw, dblink, and logical replication apply worker.  Back-patch
to v10, because another fix needs this.  In released branches, just copy
the header and keep the original.

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