Adding support for ArrayNode

[hamersaw]

TL;DR

Please replace this text with a description of what this PR accomplishes.

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

flyteorg/flyte#1131

Follow-up issue

NA

[codecov]

Codecov Report

Merging #406 (9927468) into master (0cb2bfa) will increase coverage by 0.73%.
The diff coverage is 0.00%.

❗ Current head 9927468 differs from pull request most recent head 630ca6d. Consider uploading reports for the commit 630ca6d to get more accurate results

@@            Coverage Diff             @@
##           master     #406      +/-   ##
==========================================
+ Coverage   66.66%   67.40%   +0.73%     
==========================================
  Files         145      145              
  Lines        6285     5249    -1036     
==========================================
- Hits         4190     3538     -652     
+ Misses       1815     1431     -384     
  Partials      280      280              

Flag	Coverage Δ
unittests	?

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Impacted Files	Coverage Δ
cmd/register/register_util.go	77.94% <0.00%> (+2.03%)	⬆️

... and 133 files with indirect coverage changes