Interval comparison is weird

Bug description

Datetime interval type comparison yield counter-intuitive results.

• OS: Linux
• OS Version: Ubuntu 20.04
• Architecture: amd64

Tarantool 2.10.1-0-g482d91c66

Steps to reproduce

tarantool> datetime.interval.new{hour=1} == datetime.interval.new{hour=1}
---
- true
...

tarantool> datetime.interval.new{hour=1} == datetime.interval.new{min=60}
---
- false
...

tarantool> datetime.interval.new{hour=1} > datetime.interval.new{min=60}
---
- true
...

tarantool> datetime.interval.new{hour=1} < datetime.interval.new{min=60}
---
- false
...

tarantool> datetime.interval.new{hour=1} < datetime.interval.new{min=61}
---
- false
...

Expected behavior

Simple approach to == comparison is rather understandable, but >, <, >=, <= is really confusing. @ImeevMA said that intervals are not designed to be comparable by nature, so maybe it's worth to forbid using compare operators in Lua.