Add box.error.is

[TarantoolBot]

Related dev. issue(s): tarantool/tarantool#9914

Product: Tarantool
Since: 3.2
Root document: https://www.tarantool.io/en/doc/latest/reference/reference_lua/box_error/
SME: @ nshy

Details

The function checks whether argument passed is box.error.

tarantool> box.error.is(box.error.new(box.error.UNKNOWN))
---
- true
...

tarantool> box.error.is('foo')
---
- false
...

Requested by @ nshy in tarantool/tarantool@8ed6104.