Space FixString ID is recommended to support schema level

[zhaojunnana]

The space range is too large, and there are great differences in the ID lengths of different schemas. Individual schemas may enlarge the fixstring ID length of the whole space, resulting in a waste of storage space. On the contrary, the ID length between the same schemas can be evaluated.
In addition, it is recommended to provide configuration to support truncation when the data length is greater than the fixstring definition, so that the data can be stored normally