Refactored type casting into flyteidl

[hamersaw]

TL;DR

To allow re-use of literal casting in other repositories this PR refactors the code into flyteidl.

Type

• [ ] Bug Fix
• [x] Feature
• [ ] Plugin

Are all requirements met?

• [x] Code completed
• [x] Smoke tested
• [x] Unit tests added
• [x] Code documentation added
• [ ] Any pending items have an associated Issue

Complete description

^^^

Tracking Issue

NA

Follow-up issue

NA

[codecov[bot]]

Codecov Report

Merging #548 (f1dbe0a) into master (eb695b1) will increase coverage by 1.47%. The diff coverage is 100.00%.

:exclamation: Current head f1dbe0a differs from pull request most recent head 4c343ec. Consider uploading reports for the commit 4c343ec to get more accurate results

@@            Coverage Diff             @@
##           master     #548      +/-   ##
==========================================
+ Coverage   58.85%   60.32%   +1.47%     
==========================================
  Files         170      170              
  Lines       16068    13155    -2913     
==========================================
- Hits         9457     7936    -1521     
+ Misses       5777     4385    -1392     
  Partials      834      834              

Flag	Coverage Δ
unittests	?

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Impacted Files	Coverage Δ
pkg/manager/impl/validation/execution_validator.go	73.80% <100.00%> (+1.73%)	:arrow_up:
...g/manager/impl/validation/launch_plan_validator.go	63.54% <100.00%> (+1.55%)	:arrow_up:
pkg/manager/impl/validation/signal_validator.go	81.81% <100.00%> (+2.50%)	:arrow_up:
pkg/manager/impl/validation/validation.go	95.62% <100.00%> (+0.95%)	:arrow_up:

... and 152 files with indirect coverage changes

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