* SDK - Moved the _container_builder from kfp.compiler to kfp.containers
This only moves the files. The imports remain the same for now.
* Simplified the imports.
* add requirement to component image build
* add unit test for DependencyVersion
* add unit tests, fix bugs
* revert some unit test change
* include the package name inside the VersionedDependency, enable the unit test for the component builder
* disable the component image build, this is done in another PR
* update the version name to dependency
* delete unuseful tests and add more useful unit tests
* add unit tests
* fix some unit tests
* fix bug in DependencyHelper
Alexey Volkov
nealgao
Pascal Vicaire