#387 Refactored literal type casting from flytepropeller Pull request opened by hamersaw TL;DR To allow re-use of literal casting in other repositories this PR refactors the code out of flytepropeller. Type ☐ Bug Fix ☑︎ Feature ☐ Plugin Are all requirements met? ☑︎ Code completed ☑︎ Smoke tested ☑︎ Unit tests added ☑︎ Code documentation added ☐ Any pending items have an associated Issue Complete description ^^^ Tracking Issue NA Follow-up issue NA flyteorg/flyteidl ✅ All checks have passed 11/11 successful checks