scan: extention types filters

[DifferentialOrange]

This patch clarifies the state of extension types in filters. (Any non-indexed condition or condition for any non-iterating index is a filter. All condition index except for the first one are non-iterating.)

State before the PR:

• decimal: was allowed, but precision loss had happened,
• uuid: supported in https://github.com/tarantool/crud/pull/86,
• datetime: had failed with non-informative internal error,
• interval: had failed with non-informative internal error.

State after the path:

• decimal: works fine now, no precision loss,
• uuid: unchanged,
• datetime: fully supported,
• interval: usage forbidden with explicit error since type is non-comparable.

box.error is not covered here since they cannot be used in space format.

This PR also fixes passing errors from storages, since it was required to forbid intervals in conditions.

See commits for more info.

Closes #373