Add / improve custom exceptions

[AndreiKingsley]

Now we use mostly error, require or throw common exceptions. We should introduce custom exceptions.

We have some:
https://github.com/Kotlin/dataframe/tree/master/core/src/main/kotlin/org/jetbrains/kotlinx/dataframe/exceptions
but most cases are not covered / not used.
We have https://github.com/Kotlin/dataframe/blob/master/core/src/main/kotlin/org/jetbrains/kotlinx/dataframe/exceptions/ColumnNotFoundException.kt
that are not used anywhere!

It can also significantly improve DF debugging — exception should contain df/row/column field for that purpose.

[Jolanrensen]

Even better would be Rich Errors https://github.com/Kotlin/KEEP/blob/main/proposals/KEEP-0441-rich-errors-motivation.md once they arrive. But until then, yes, DataFrameException all the way ;P