fix: typing issues in packages

[brionmario]

Description

• Certain modules have any typings which doesn't comply with strict mode.

Steps to Reproduce

Use the packages in a strict mode true setup.

Please select the area the issue is related to

@asgardeo/javascript, @asgardeo/react

Version

current

Environment Details (with versions)

N/A

Reporter Checklist

• I have searched the existing issues and this is not a duplicate.
• I have provided all the necessary information.
• I have tested the issue on the latest version of the package.