* support placeholder in metadata dict
* add unit tests
* add compilation test
* fix tests
* update compiler test
* use 'metadata' as input key
* update compiler test and golden snapshot
* add int input to compiler test
* change constant name
* use util function
* support f-strings in dynamic import metadata; add and update tests
* update method name after rebase
* make compile consistent across python versions
* add runtime artifact instance creation logic
* refactor executor
* add executor tests
* add custom artifact type import handling and tests
* fix artifact class construction
* fix custom artifact type in tests
* add typing extensions dependency for all python versions
* use mock google namespace artifact for tests
* remove print statement
* update google artifact golden snapshot
* resolve some review feedback
* remove handling for OutputPath and InputPath custom artifact types; update function names and tests
* clarify named tuple tests
* update executor tests
* add artifact return and named tuple support; refactor; clean tests
* implement review feedback; clean up artifact names
* move test method
* remove dependency of deprecated on v2
* use new artifact identification logic
* add custom artifact type compiler test
* compile schema_version from non-kfp artifacts
* update tests
* add importer to compiler test
* update golden snapshots
* fix type checking code
* undo executor_test diff
* remove gcpc types compiler test
* add compilation test comment
* update google artifact handling
* update compiler test
* only permit system. and google. artifact types; add tests
* update compiler test
* simplify type checking logic
* use bundled artifact types in PipelineArtifactChannel
* raise error on unknown v1 input or output
* add type utils and move functions
* add type utils tests
* remove schema_version from inputspec and outputspec
* update artifact proto creation and tests
* propogate bundled artifact type string changes throughout sdk
* update golden snapshot
* remove unused v1 compat and tests
* update type checking and tests to validate schema_version using semantic versioning
* update importer sample
* update test data config
* update test_data config
* clean up sample
* clean up sample
Connor McCarthy
Chen Sun
JOCSTAA
Scott_Xu