Add tests and docs for toBlob. Bump version.

FossilOrigin-Name: d7358c9d8961f2b70f83ca4e19d4c43408e59cc169f072a238745060edb09de9

tests/values/t_can_return_a_blob_object.nim

@@ -0,0 +1,32 @@
+# vim: set et sta sw=4 ts=4 :
+
+import kuzu
+
+var db   = newKuzuDatabase()
+var conn = db.connect
+
+var q = conn.query( "CREATE NODE TABLE Doot ( id SERIAL, data BLOB, PRIMARY KEY(id) )" )
+
+# (188, 189, 186, 170)
+q = conn.query( """CREATE (d:Doot {data: BLOB('\\xBC\\xBD\\xBA\\xAA')})""" )
+
+var stmt = conn.prepare( "CREATE (d:Doot {data: encode($str)})" )
+q = stmt.execute( (str: "Hello!") )
+q = conn.query( "MATCH (d:Doot) RETURN d.data" )
+
+var expected: seq[byte] = @[188, 189, 186, 170]
+var val = q.getNext[0]
+assert val.kind == KUZU_BLOB
+assert val.toBlob == expected
+
+expected = @[72, 101, 108, 108, 111, 33]
+val = q.getNext[0]
+assert val.kind == KUZU_BLOB
+assert val.toBlob == expected
+
+var str: string
+for c in expected:
+    str.add( c.char )
+
+assert str == "Hello!"
+