[DSL] Enable Grid with DSL syntax

[jswong65]

This PR mainly enable Grid, Row, and Column with DSL syntax. It also includes some fixes for some demos.

1. Updates ConstraintLayoutBaseScope.kt and ConstraintSetParser.java to enable Grid using DSL.
2. Add demos - GridDslDemo.kt and RowColumnDslDemo.kt
3. Add tests - GridDslTest.kt and RowColumnDslTestkt
4. Update existing demos for Grid with JSON by making the type in lowercase.
5. Update the build.gradle - same as #780

There is an issue with padding that I need to investigate more. Also, there are some build issues with ComposeConstraintlayout project that I had to comment out some of the files.

Some of the demos Demo1

Demo4

Test results