[CLNP-7712] chore: add exports field in package.json for module resolution

[OnestarLee]

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For Internal Contributors

[CLNP-7712](https://sendbird.atlassian.net/browse/CLNP-7712)

Description Of Changes

metro.config.js 에서 unstable_enablePackageExports 옵션과 resolverMainFields 셋팅 처리에 따라서 package.json 에 exports 필드가 존재하지 않을때 폴백 처리로 인해서 동일한 패키지가 cjs, esm으로 중복 로드 되는 경우가 있습니다. 사용자가 어떤 셋팅을하더라도 동일한 모듈이 로드되도록 exports 를 추가하였습니다

ex) 사용자가 unstable_enablePackageExports 를 true resolverMainFields 의 우선순위를 main 으로 하는경우
샘플의 chat-js 에는 exports 필드가 존재하기때문에 esm 모듈을 사용,
샘플에서 사용하는 uikit-react-native 에서는 main의 cjs 를 사용 -> uikit-tools 의 cjs 사용 -> chat-js의 cjs사용

Types Of Changes

What types of changes does your code introduce to this project?
Put an x in the boxes that apply_

• Bugfix
• New feature
• Documentation (correction or otherwise)
• Cosmetics (whitespace, appearance (ex) Prettier)
• Build configuration
• Improvement (refactor code)
• Test

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 10.89%. Comparing base (ca6a9a9) to head (8659697).

Additional details and impacted files

@@           Coverage Diff            @@
##             main     #270    +/-   ##
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  Coverage   10.89%   10.89%            
========================================
  Files         360      360            
  Lines        9016     9016            
  Branches     2537     2419   -118     
========================================
  Hits          982      982            
  Misses       8033     8033            
  Partials        1        1            

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