[Asset-39] Update MATIC to POL

[jormal]

Pull Request

Description

Polygon network의 native coin이 POL로 바뀌었습니다.
이를 적용합니다.

Related issue: ASSET-39

Changes

• 24aaae2: POL asset 추가
• 60d8607: Polygon network에서 native coin 변경

Types of Changes (multiple options can be selected)

• Create asset information
• Update asset information
• Delete asset information
• Other {{Please add description here}}

Checklist

• Did you pass the tests? (Did you execute pytest -l in your PC and get a green light?)
• Did you run the pre-process?
• Have you added and run tests to validate the changes?
• Have you updated the documentation?
• Have you updated the version in {PWD}/VERSION if you need?

[jormal]

추후 POL 정식 적용 과정 확인하고 마무리 작업 진행하겠습니다.

[jormal]

commit message 수정때문에 재리뷰 요청이 되었네요 ㅠㅠ 리뷰 요청드립니다