Migrate all Gradle files from Groovy to Kotlin

[ankur141295]

This pull request contains the following changes:

• Gradle files migrated from Groovy to Kotlin.
• BuildScript has been removed in favor of Plugins from the Top-Level Gradle File. See this
• The app-level Gradle file's plugins block now gets plugin information from a .toml file. Additionally, the compile-sdk, target-sdk, min-sdk, version-code, and version-name data also come from the .toml file.

This change closes #121

@waseefakhtar Please review the changes and let me know if you have any questions.

[ankur141295]

This looks great! 👏

Just one question: Are you sure compile-sdk, target-sdk, min-sdk, version-code, and version-name is retrieved from the .toml file? .toml mentions they're not used anywhere and cmd-clicking on libs.versions.min.sdk.version.get().toInt() shows another declaration.

I'm not sure why the usage of some properties isn't displayed in the .toml file. However, if you command-click to open the generated file, you can still see that the declared property is being referenced. For example

Additionally, the Kotlin Compiler Version is also sourced from the .toml file, but it's marked as unused there. However, this code is preexisting and functioning properly.

[waseefakhtar]

This looks great! 👏 Just one question: Are you sure compile-sdk, target-sdk, min-sdk, version-code, and version-name is retrieved from the .toml file? .toml mentions they're not used anywhere and cmd-clicking on libs.versions.min.sdk.version.get().toInt() shows another declaration.

I'm not sure why the usage of some properties isn't displayed in the .toml file. However, if you command-click to open the generated file, you can still see that the declared property is being referenced. For example

Additionally, the Kotlin Compiler Version is also sourced from the .toml file, but it's marked as unused there. However, this code is preexisting and functioning properly.

Okay that makes sense! 👌