Add the sqlite3_database_file_object() interface.

FossilOrigin-Name: f534ebeaaf34f825550138f09f9a40221dfa7cd5c6537ef9f86dce5249025ec3

diff --cc manifest
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--- 2/manifest
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- C Do\snot\suse\sO_NOFOLLOW\swhen\sopening\sa\sdirectory\sjust\sto\scall\sfsync()\son\nthat\sdirectory.
- D 2020-04-20T17:35:32.334
 -C Add\sthe\ssqlite3_database_file_object()\sinterface\sto\ssqlite3ext.h.
 -D 2020-04-21T19:27:08.207
++C Add\sthe\ssqlite3_database_file_object()\sinterface.
++D 2020-04-21T20:19:25.607
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  F LICENSE.md df5091916dbb40e6e9686186587125e1b2ff51f022cc334e886c19a0e9982724
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--- 2/manifest.uuid
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