Create the new string_agg(X,Y) aggregate function which is an alias for

the two-argument group_concat(X,Y) function, for compatibility with
SQL-Server and PostgreSQL.

FossilOrigin-Name: a3b3df8a9e43f1880a904b76027db56ed504a84622831c96ba1962a19bbed762

diff --cc manifest
index 68e5bc00173861e97aed2a067e992939273598ec,4622f040b4a5455833cee001d2c6028a5437f6f8..d0d2798f6f8596e8f2ca71d75d1624c3b08276db
--- 1/manifest
--- 2/manifest
+++ b/manifest
@@@ -1,5 -1,5 +1,5 @@@
- C Avoid\san\sunnecessary\smalloc()\sfor\sthe\spage\susage\sbitmap\swhen\srunning\na\spartial\sintegrity_check.
- D 2023-10-21T11:06:03.224
 -C Fix\sa\stest\scase\sbroken\sby\sthe\sprevious\scheck-in.
 -D 2023-10-21T11:00:57.055
++C Create\sthe\snew\sstring_agg(X,Y)\saggregate\sfunction\swhich\sis\san\salias\sfor\nthe\stwo-argument\sgroup_concat(X,Y)\sfunction,\sfor\scompatibility\swith\nSQL-Server\sand\sPostgreSQL.
++D 2023-10-21T11:13:47.696
  F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
  F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
  F LICENSE.md df5091916dbb40e6e9686186587125e1b2ff51f022cc334e886c19a0e9982724
@@@ -2135,8 -2135,8 +2135,8 @@@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a9
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  F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
- P fba3129d1362dd3ee04d61cb3d3c48518cd98dde3febc85298f411776d60073e
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- Z cc633995022531837a5b59b3eaccd09f
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++Z 18932cf81e43303a0689b13f1b4c7092
  # Remove this line to create a well-formed Fossil manifest.

diff --cc manifest.uuid
index b9621f9e85d30a68b4b34c995e3c709ec3a73771,21862a2066aac682dd367995c948dd68d5ce1279..f6e0c18d13d6cf98ae71e7c575f7c884a2b46d73
--- 1/manifest.uuid
--- 2/manifest.uuid
+++ b/manifest.uuid
@@@ -1,1 -1,1 +1,1 @@@
- 2904fcbeebba9189cebc48e58d12fc46f78ee23d8c4d46644606691f8cabb80c
 -1e61864c3bffec133632f4575d59d11936e8bafc089c4d84a129dcaf7e9b6d7d
++a3b3df8a9e43f1880a904b76027db56ed504a84622831c96ba1962a19bbed762