Saurabh Lalwani

api package name in an open source project is kinda redundant so moved all the interfaces/objects etc. one level up and dropped the api package

Currently, we are using allProjects and subProjects approach which is not [recommended](https://docs.gradle.org/current/userguide/sharing_build_logic_between_subprojects.html#sec:convention_plugins_vs_cross_configuration) Switch to [ConventionPlugin](https://docs.gradle.org/current/userguide/sharing_build_logic_between_subprojects.html#sec:convention_plugins) to make subproject dependencies more clear

Created request and config objects needed to make authentication request and authentication response

Merging main into 1.x branch

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Cutting the current main into 1.X branch to prepare main for the 2.X

Added auth demp app

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- Created a demo app using authentication module - app supports prefilling user information - demonstrates how to use app priority - shows a toast message for token or error

Updated the upload-artifact action version from v2 to v4 as per github guideline https://github.blog/changelog/2024-02-13-deprecation-notice-v1-and-v2-of-the-artifact-actions/