Re: row filtering for logical replication

PSA the v44* set of patches.

The following review comments are addressed:

v44-0001 main patch
- Renamed the TAP test 026->027 due to clash caused by recent commit [1]
- Refactored table_close [Houz 23/11] #2
- Alter compare where clauses [Amit 24/11] #0
- PG docs CREATE SUBSCRIPTION [Tang 30/11] #2
- PG docs CREATE PUBLICATION [Vignesh 30/11] #1, #4, [Tang 30/11] #1,
[Tomas 23/9] #2

v44-0002 validation walker
- Add NullTest support [Peter 18/11]
- Update comments [Amit 24/11] #3
- Disallow user-defined types [Amit 24/11] #4
- Errmsg - skipped because handled by top-up [Vignesh 23/11] #2
- Removed #if 0 [Vignesh 30/11] #2

v44-0003 new/old tuple
- NA

v44-0004 tab-complete and pgdump
- Handle table-list commas better [Vignesh 23/11] #2

v44-0005 top-up patch for validation
- (This patch will be added again later)

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[1] https://github.com/postgres/postgres/commit/8d74fc96db5fd547e077bf9bf4c3b67f821d71cd
[Tomas 23/9] https://www.postgresql.org/message-id/574b4e78-2f35-acf3-4bdc-4b872582e739%40enterprisedb.com
[Peter 18/11]
https://www.postgresql.org/message-id/flat/CAFPTHDa67_H%3DsALy%2BEqXDGmUKm1MO-83apffZkO34RELjt_Prg%40mail.gmail.com#e5fb0d17564d7ffb11a64858598f5185
[Houz 23/11]
https://www.postgresql.org/message-id/OS0PR01MB57162EB465A0E6BCFDF9B3F394609%40OS0PR01MB5716.jpnprd01.prod.outlook.com
[Vignesh 23/11]
https://www.postgresql.org/message-id/CALDaNm2bq-Zab3i5pvuA3UTxHvo3BqPwmgXbyznpw5vz4%3DfxpA%40mail.gmail.com
[Amit 24/11]
https://www.postgresql.org/message-id/CAA4eK1%2BXd%3DkM5D3jtXyN%2BW7J%2BwU-yyQAdyq66a6Wcq_PKRTbSw%40mail.gmail.com
[Tang 30/11]
https://www.postgresql.org/message-id/OS0PR01MB6113F2E024961A9C7F36BEADFB679%40OS0PR01MB6113.jpnprd01.prod.outlook.com
[Vignesh 30/11]
https://www.postgresql.org/message-id/CALDaNm2T3yXJkuKXARUUh%2B%3D_36Ry7gYxUqhpgW8AxECug9nH6Q%40mail.gmail.com

Kind Regards,
Peter Smith.
Fujitsu Australia