add first_block_num for get_info command 📦

[heifner]

Change Description

EPE 737

add first_block_num to the result of get_info command, the first block num is fetched from block_log_imp object, and then fill this number to get info result.

https://github.com/EOSIO/eos/pull/10087

Change Type

Select ONE

• [ ] Documentation
• [ ] Stability bug fix
• [x] Other
• [ ] Other - special case

Consensus Changes

• [ ] Consensus Changes

API Changes

• [ ] API Changes

Documentation Additions

• [ ] Documentation Additions