Fix korean road address

[semi-yu]

What does this change

Adds building-number(건물 번호) to a road address in 'ko_KR' locale. Without building-numbers, faker-generated addresses do not reflect real addressing system in Republic of Korea(South korea).

before:
address form: "{{road_name}}{{road_suffix}}"
대전광역시 강서구 석촌호수거리

after:
below shows one of possible outputs

• 대전광역시 강서구 석촌호수거리 110 (Basic building number format)
• 대전광역시 강서구 석촌호수거리 지하110 (The building's main entrance is underground)
• 대전광역시 강서구 석촌호수거리 110-31 (The building is cramped together, distinguished by sub-building number; exact format is (main-building-number)-(sub-building-number))

(FYI, 석촌호수거리 is a road name.)

Change above also applies to the other form of an address, which is defined as : "{{road_name}}{{road_number}}{{road_suffix}}".

What was wrong

The original source code did not include any logic to generate building numbers. Although it is explained on comments written on source code.

How this fixes it

Added additional strings to describe building numbers.

Fixes #2132

Checklist

• I have read the documentation about CONTRIBUTING
• I have read the documentation about Coding style
• I have run make lint

[fcurella]

Thank you!