[#22449] YSQL: import wal2json wal2json_2_6

Summary:
Subtree merge wal2json into
src/postgres/third-party-extensions/wal2json. Ran the following:

```
git remote add wal2json https://github.com/eulerto/wal2json.git
git fetch wal2json wal2json_2_6:tags/wal2json_2_6
git subtree add --prefix=src/postgres/third-party-extensions/wal2json wal2json wal2json_2_6
```

```
    Add 'src/postgres/third-party-extensions/wal2json/' from commit '75629c2e1e81a12350cc9d63782fc53252185d8d'

    git-subtree-dir: src/postgres/third-party-extensions/wal2json
    git-subtree-mainline: 66ed3a5
    git-subtree-split: 75629c2
```

Choose wal2json_2_6 since it is the latest version that supports PG 11
according to their [[ https://github.com/eulerto/wal2json/tree/master?tab=readme-ov-file#unix-based-operating-systems | README ]].
Integrating wal2json into the build and YB specific changes will be done as a followup diff.
Jira: DB-11366

Test Plan: jenkins: compile only

Reviewers: sumukh.phalgaonkar, jason, skumar

Reviewed By: jason

Subscribers: steve.varnau, yql

Differential Revision: https://phorge.dev.yugabyte.com/D36690

src/postgres/third-party-extensions/wal2json/.gitignore

@@ -0,0 +1,6 @@
+/regression.diffs
+/regression.out
+/results/
+/wal2json.bc
+/wal2json.so
+*.o

src/postgres/third-party-extensions/wal2json/LICENSE

@@ -0,0 +1,27 @@
+Copyright (c) 2013-2024, Euler Taveira de Oliveira
+All rights reserved.
+
+Redistribution and use in source and binary forms, with or without modification,
+are permitted provided that the following conditions are met:
+
+* Redistributions of source code must retain the above copyright notice, this
+  list of conditions and the following disclaimer.
+
+* Redistributions in binary form must reproduce the above copyright notice, this
+  list of conditions and the following disclaimer in the documentation and/or
+  other materials provided with the distribution.
+
+* Neither the name of the Euler Taveira de Oliveira nor the names of its
+  contributors may be used to endorse or promote products derived from
+  this software without specific prior written permission.
+
+THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR
+ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON
+ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+(INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

src/postgres/third-party-extensions/wal2json/Makefile

@@ -0,0 +1,37 @@
+MODULES = wal2json
+
+REGRESS = cmdline insert1 update1 update2 update3 update4 delete1 delete2 \
+		  delete3 delete4 savepoint specialvalue toast bytea message typmod \
+		  filtertable selecttable include_timestamp include_lsn include_xids \
+		  include_domain_data_type truncate type_oid actions position default \
+		  pk rename_column numeric_data_types_as_string
+
+PG_CONFIG = pg_config
+PGXS := $(shell $(PG_CONFIG) --pgxs)
+include $(PGXS)
+
+# message API is available in 9.6+
+ifneq (,$(findstring $(MAJORVERSION),9.4 9.5))
+REGRESS := $(filter-out message, $(REGRESS))
+endif
+
+# truncate API is available in 11+
+ifneq (,$(findstring $(MAJORVERSION),9.4 9.5 9.6 10))
+REGRESS := $(filter-out truncate, $(REGRESS))
+endif
+
+# actions API is available in 11+
+# this test should be executed in prior versions, however, truncate will fail.
+ifneq (,$(findstring $(MAJORVERSION),9.4 9.5 9.6 10))
+REGRESS := $(filter-out actions, $(REGRESS))
+endif
+
+# make installcheck
+#
+# It can be run but you need to add the following parameters to
+# postgresql.conf:
+#
+# wal_level = logical
+# max_replication_slots = 10
+#
+# Also, you should start the server before executing it.