This pr implements the `remove-section` option for a `DXContainer`
object in `llvm-objcopy`.
It implements a base `removeParts` to the minimal `object`
representation of a `DXContainerObject`.
This is the second step to implement
https://github.com/llvm/llvm-project/issues/150275 as a compiler actions
that invokes llvm-objcopy for functionality.