[#22449] YSQL: wal2json YB specific changes

Summary:
Diff D35521 incorrectly imported `wal2json` plugin to contrib folder but it should have been added to third-party-extensions.
It also added YB specific changes on top. So two things are required to fix this.

- Add wal2json as subtree merge to third-party-extensions folder.
- Add YB specific changes on top of that.

First part of subtree done by diff D36690. This diff addresses the part to add YB specific changes.

Difference between `third-party-extensions/wal2json` and `contrib/wal2json`:

- `sql/` and `expected/` folders that were removed from contrib/wal2json are restored in third-party-extensions/wal2json. Although not added to a test schedule.
- `README.md` that was from contrib/wal2json is restored in third-party-extensions/wal2json. Made inline with [[ https://github.com/eulerto/wal2json/tree/wal2json_2_6 | thirdparty ]] repo.
- `wal2json.sln` and `wal2json.vcxproj` :  provide build configuration to build on windows. Restored them and inline with thirdparty repo.
- `logical.conf` which was present in contrib/wal2json not added in third-party-extensions/wal2json , not required.
- `.gitignore` now inline with thirdparty repo.
- `Makefile` now inline with thirdparty repo. No change required as plugin is built without any changes.
Jira: DB-11366

Test Plan:
Jenkins: test regex: .*ReplicationSlot.*

  ./yb_build.sh --java-test 'org.yb.pgsql.TestPgReplicationSlot#testWithWal2JsonPlugin'

Reviewers: sumukh.phalgaonkar, jason, skumar

Reviewed By: jason

Subscribers: yql

Differential Revision: https://phorge.dev.yugabyte.com/D36694

src/postgres/contrib/Makefile

@@ -48,8 +48,7 @@ SUBDIRS = \
 		tsm_system_rows \
 		tsm_system_time \
 		unaccent	\
-		vacuumlo	\
-		wal2json
+		vacuumlo
 
 ifeq ($(with_openssl),yes)
 SUBDIRS += sslinfo