Pipeline support parallel decoding plugin of opengauss

[azexcy]

Parallel decoder enabled by default after opengauss 3
Fixes: #29554

Changes proposed in this pull request:

• Pipeline support parallel decoding plugin of opengauss

---

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• My code follows the code of conduct of this project.
• I have self-reviewed the commit code.
• I have (or in comment I request) added corresponding labels for the pull request.
• I have passed maven check locally : ./mvnw clean install -B -T1C -Dmaven.javadoc.skip -Dmaven.jacoco.skip -e.
• I have made corresponding changes to the documentation.
• I have added corresponding unit tests for my changes.

[azexcy]

https://docs-opengauss.osinfra.cn/zh/docs/5.0.0-lite/docs/DeveloperGuide/%E7%A4%BA%E4%BE%8B-%E9%80%BB%E8%BE%91%E5%A4%8D%E5%88%B6%E4%BB%A3%E7%A0%81%E7%A4%BA%E4%BE%8B.html

mpp_decoding

BEGIN 1004573
{"table_name":"public.t_sales","op_type":"INSERT","columns_name":["id","goods_name","sales_date","sales_volume","sales_store"],"columns_type":["integer","character","timestamp without time zone","integer","character"],"columns_val":["1","'aq                  '","'2024-03-14 20:30:58'","2","'d2                  '"],"old_keys_name":[],"old_keys_type":[],"old_keys_val":[]}
COMMIT 1004573 (at 2024-03-14 20:31:12.098179+08) CSN 951909

Parallel decoding plugin

BEGIN CSN: 951909 first_lsn: 5/59825858
{"table_name":"public.t_sales","op_type":"INSERT","columns_name":["id","goods_name","sales_date","sales_volume","sales_store"],"columns_type":["integer","character","timestamp without time zone","integer","character"],"columns_val":["1","'aq                  '","'2024-03-14 20:30:58'","2","'d2                  '"],"old_keys_name":[],"old_keys_type":[],"old_keys_val":[]}
commit xid: 1004573

[sandynz]

BTW: Could we put related official openGauss documents in comment