Improve overall stability

[pushpalroy]

• Add compose compiler metrics config
• Add release build config
• Use immutable collections
• Mark classes with Immutable annotations
• Compiler report here before stabilization: https://gist.github.com/pushpalroy/6e5b0f8ccbfab450ea9df666b468cfaa
• Compiler report here after stabilization: https://gist.github.com/pushpalroy/a8fa905a25ebbe899384e11e6ea9d2f6
• Make title optional
• Reduce the default height of the item to 64.dp