chore: add type definitions to package.json for better TS support

[yashoswalyo]

Explain the feature/fix

Adds types declaration for better TS support.

Does this PR introduce a breaking change

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Ready-for-merge Checklist

• Expected files: all files in this pull request are related to one feature request or issue (no stragglers)?
• Does the change have appropriate unit tests?
• Did tests pass?
• Did you update or add any necessary documentation (README.md, WHY.md, etc.)?
• My changes generate no new warnings
• I have performed a self-review of my own code
• I have documented my code, particularly in areas like todo, complex logic, quick fix, temporary patch, etc.

If it is a new component

• Does your component follow One Platform style guidelines?
• Does your component web accessibility standards? Helper Doc
• Does your component support desktop screen sizes (350px, 720px, 1150px ,1920px)

Browsers you have tested in

• Latest two versions of Mozilla Firefox and Google Chrome supported by Red Hat Enterprise Linux distribution
• Google Chrome [Latest 2 versions]
• Mozilla Firefox [Latest 2 versions]
• Microsoft Edge [Latest 2 versions]
• Apple Safari [Latest 2 versions]
• Microsoft Internet Explorer 11