* comparison working with operator overloading

* Branching work in progress

* Complete evaluation

* Branches working

* All conditional cases

* Update flytekit/common/workflow.py

Co-authored-by: Yee Hing Tong <wild-endeavor@users.noreply.github.com>

* Apply suggestions from code review

Co-authored-by: Yee Hing Tong <wild-endeavor@users.noreply.github.com>

* fixed one comment

* Fixes to execution state

Co-authored-by: Ketan Umare <kumare@lyft.com>
Co-authored-by: Ketan Umare <16888709+kumare3@users.noreply.github.com>

Any task can be mocked and mocking behaviour should be altered based on
inputs

- We could stat and ensure that the passed string is a file, but
   uploader will fail?

* WIP

* Typed schema support WIP

* Working FlyteSchema type transformer

* Type engine unit test failure fix

* Clean up

* FlyteSchema fixes to make it a cleaner interface

* Fix type engine

* Formatting fix

Ensure that inputs variables to a branch node have unique names instead of copying the name from the promise as is.

…uts (#261)

…#264)

* Add dataclasses support and tests for it

* unit test to show arbitrary classes are not supported

* fmt fix

The new API requires at least py37 to function.

* Fix conditions '&' evaluation

* Fix conditions '&' evaluation

* fix test

* lint

* isort

* fix tuple handling in condition branches

* isort

…#288)

* Switching from using model Metadata -> TaskMetadata (#298)

* Switching from using model Metadata -> TaskMetadata

  TaskMetadata will be maintained as a shadow and allows decoupling of
protocol buffer types from contributor code and user code. This allows
more flexiblity

* addressed comments

* unit test fix

* Formatting fixed

…gistration time (#303)