Checkpoint.

- Add column names and types to KuzuQuery objects.
- Start sketching out type conversions.
- Add a "kind" method to KuzuValue, that returns its Kuzu type. (type is a
  reserved word)
- Fix some tests for post v0.8.2 behaviors.

FossilOrigin-Name: 64c0694e58507ce91f2e0eced106c9fef2a739665ddaa29f60b4ca9fe65678fe

src/kuzu/tuple.nim

@@ -18,13 +18,6 @@ proc `[]`*( tpl: KuzuFlatTuple, idx: int ): KuzuValue =
     if kuzu_flat_tuple_get_value( addr tpl.handle, idx.uint64, addr result.handle ) == KuzuSuccess:
         result.valid = true
 
-        #
-        # FIXME: type checks and conversions from supported kuzu
-        # types to supported Nim types.
-        #
-        # Currently the value can only be stringified via `$`.
-        #
-
     else:
         raise newException( KuzuIndexException,
             &"Unable to fetch tuple value at idx {idx}. ({tpl.num_columns} column(s).)" )