sql: specify field types in ephemeral space format

This patch specifies field types in ephemeral space format in SQL.
Prior to this patch, all fields had a SCALAR field type.

This patch allows us to not use the primary index to obtain field
types, since now the ephemeral space has field types in the
format. This allows us to change the structure of the primary
index, which helps to solve the issue #4256. In addition, since we
can now set the field types of the ephemeral space, we can use
this feature to set the field types according to the left value of
the IN operator. This will fix issue #4692.

Needed for #4256
Needed for #4692
Closes #3841