Add the experimental sqlite3_schema_copy() API, for copying schemas between database...

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diff --cc manifest
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--- 1/manifest
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- C Up\slogs\sto\s"v=21".
- D 2024-12-23T11:31:16.861
 -C Minor\supdates\sto\sschemacopy.test.
 -D 2025-01-10T17:09:51.516
++C Add\sthe\sexperimental\ssqlite3_schema_copy()\sAPI,\sfor\scopying\sschemas\sbetween\sdatabase\shandles.
++D 2025-01-10T17:36:51.356
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diff --cc manifest.uuid
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