fix: missing types

The .gitignore is used as a fallback whne publishing to exclude files
to NPM[^1]. As such, the types were not included in the release. This PR
removes the .gitignore to match the web SDK repo and allow the types to
be published to NPM.

[^1]: https://docs.npmjs.com/cli/v9/configuring-npm/package-json#files

Author: stnguyen90