iproto: export IPROTO constants and features to Lua

[TarantoolBot]

Product: Tarantool
Since: 2.11

Root document: https://www.tarantool.io/en/doc/latest/dev_guide/internals/box_protocol/
SME: @ CuriousGeorgiy

Details

For the API description and usage examples, see:

• design document;
• Export IPROTO constants and features to Lua tarantool#7894.
  Requested by @CuriousGeorgiy in tarantool/tarantool@fe89aab.