Added default no limit on storage

[yindia]

TL;DR

Context :- A user started discussion regarding a bug in copiliot. where copiliot failes with large files because of stdlib limit check. We don't want any limit on size in case of copiliot

• If GetLimitMegabytes is 0 then don't check size limit

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

How did you fix the bug, make the feature etc. Link to any design docs etc

Tracking Issue

Remove the 'fixes' keyword if there will be multiple PRs to fix the linked issue

fixes flyteorg/flyte#1251
flyteorg/flyte#1253
flyteorg/flyte#1287

Follow-up issue

NA
OR
https://github.com/flyteorg/flyte/issues/

[codecov]

Codecov Report

Merging #93 (ef929ab) into master (92b25c6) will increase coverage by 1.38%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master      #93      +/-   ##
==========================================
+ Coverage   65.49%   66.87%   +1.38%     
==========================================
  Files          59       59              
  Lines        2275     2817     +542     
==========================================
+ Hits         1490     1884     +394     
- Misses        642      788     +146     
- Partials      143      145       +2     

Flag	Coverage Δ
unittests	65.28% <100.00%> (-0.21%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
storage/stow_store.go	73.01% <100.00%> (+1.75%)	⬆️
logger/logger.go	54.26% <0.00%> (-8.60%)	⬇️
storage/config_flags.go	53.33% <0.00%> (-2.23%)	⬇️
config/viper/viper.go	6.86% <0.00%> (-1.16%)	⬇️
atomic/atomic.go	73.91% <0.00%> (-1.09%)	⬇️
sets/generic_set.go	94.56% <0.00%> (-0.44%)	⬇️
config/url.go	100.00% <0.00%> (ø)
errors/errors.go	100.00% <0.00%> (ø)
ioutils/bytes.go	100.00% <0.00%> (ø)
futures/future.go	100.00% <0.00%> (ø)
... and 49 more

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[EngHabu]

Can you elaborate on why this change?