Allow "in place" tablespaces.

This is a backpatch to branches 10-14 of the following commits:

7170f2159fb2 Allow "in place" tablespaces.
c6f2f01611d4 Fix pg_basebackup with in-place tablespaces.
f6f0db4d6240 Fix pg_tablespace_location() with in-place tablespaces
7a7cd84893e0 doc: Remove mention to in-place tablespaces for 
pg_tablespace_location()
5344723755bd Remove unnecessary Windows-specific basebackup code.

In-place tablespaces were introduced as a testing helper mechanism, but
they are going to be used for a bugfix in WAL replay to be backpatched
to all stable branches.

I (Álvaro) had to adjust some code to account for lack of
get_dirent_type() in branches prior to 14.

Author: Thomas Munro <thomas.mu...@gmail.com>
Author: Michaël Paquier <mich...@paquier.xyz>
Author: Álvaro Herrera <alvhe...@alvh.no-ip.org>
Discussion: https://postgr.es/m/20220722081858.omhn2in5zt3g4nek@alvherre.pgsql

Branch
------
REL_10_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/7bdbbb87340f4cb9f262320a28be8f87d4c38308

Modified Files
--------------
doc/src/sgml/config.sgml          | 19 +++++++++++++++++++
src/backend/access/transam/xlog.c | 20 ++++++++++++++++++++
src/backend/commands/tablespace.c | 39 ++++++++++++++++++++++++++++++++-------
src/backend/utils/adt/misc.c      | 29 +++++++++++++++++++++++++++++
src/backend/utils/misc/guc.c      | 12 ++++++++++++
src/include/commands/tablespace.h |  2 ++
6 files changed, 114 insertions(+), 7 deletions(-)

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