feat: 한글 문장과 문자가 담긴 배열을 인자로 받아 규칙에 맞게 합성하는 `assemble` 함수 추가

[evan-moon]

Overview

https://github.com/toss/es-hangul/issues/18 에서 이슈레이징되었던 한글 문장과 문자가 담긴 배열을 인자로 받아 규칙에 맞게 합성하는 assemble 함수, 그리고 한글 문장의 마지막 글자의 홑받침 여부를 판단하는 hasSingleBatchim를 추가합니다.

assembleHangul(['아버지가', ' ', '방ㅇ', 'ㅔ ', '들ㅇ', 'ㅓ갑니다']); // 아버지가 방에 들어갑니다
assembleHangul(['아버지가', ' ', '방에 ', '들어갑니다']); // 아버지가 방에 들어갑니다
assembleHangul(['ㅇ', 'ㅏ', 'ㅂ', 'ㅓ', 'ㅈ', 'ㅣ']); // 아버지

hasSingleBatchim('갑') // true
hasSingleBatchim('값') // false
hasSingleBatchim('토') // false

기타 변경사항

• _internal 모듈을 Directory로 변경하고, 내부에서만 사용할 한글 도메인의 함수를 추가하였습니다.
• _internal 모듈에 문자열을 합성하는 joinString, 공백 문자열 여부를 판단하는 isBlank, throw 행위를 추상화하기 위한 assert 함수가 추가되었습니다.
• src/chosungIncludes.ts 내에서 사용하고 있지 않은 모듈 디펜던시를 제거하였습니다.

PR Checklist

• [x] I read and included theses actions below

1. I have read the Contributing Guide
2. I have written documents and tests, if needed.

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