Add the experimental sqlite3session_changeset_size() API.

FossilOrigin-Name: 3de544d495fee553d95fde3fb656745d633138115d25ed39760a1ea7c8c3fae6

diff --cc manifest
index cdecd898397da34fbdd0456bbabb943ca9866997,11730cc2f53daa4b2e6c9c54b37f2a80abf47cc7..f3b5c36ea12cf9c3babe995d3941be83a8a92618
--- 1/manifest
--- 2/manifest
+++ b/manifest
@@@ -1,5 -1,5 +1,5 @@@
- C Improved\shandling\sof\serrors\sin\sALTER\sTABLE\sRENAME.\ndbsqlfuzz\s3e3e2e076e53d02288f80af41a11143a6ddf8c88
- D 2021-04-22T16:54:34.579
 -C Add\sthe\ssqlite3session_object_config()\sAPI.\sCurrent\sused\sto\senable/disable\scollecting\sdata\sfor\ssqlite3session_changeset_size().
 -D 2021-04-22T17:40:28.167
++C Add\sthe\sexperimental\ssqlite3session_changeset_size()\sAPI.
++D 2021-04-22T17:55:42.561
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  F LICENSE.md df5091916dbb40e6e9686186587125e1b2ff51f022cc334e886c19a0e9982724
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diff --cc manifest.uuid
index c3e5437c91ad8e5562f11813836a88d7229ddb8c,9cca027a552f23279f7fc83aa481d242f706f0b6..b0538c1e629f1ba9a1f18dd358c1db19c8a95a58
--- 1/manifest.uuid
--- 2/manifest.uuid
+++ b/manifest.uuid
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