Add offloaded path to literal

[katrogan]

Why are the changes needed?

see RFC proposal here: #5103

What changes were proposed in this pull request?

Updates literal proto message only.

How was this patch tested?

Setup process

Screenshots

Check all the applicable boxes

• I updated the documentation accordingly.
• All new and existing tests passed.
• All commits are signed-off.

Related PRs

Docs link

[codecov]

Codecov Report

Attention: Patch coverage is 0% with 8 lines in your changes missing coverage. Please review.

Project coverage is 36.17%. Comparing base (4f9227a) to head (a5cefa0).
Report is 135 commits behind head on master.

Files with missing lines	Patch %	Lines
flyteidl/gen/pb-go/flyteidl/core/literals.pb.go	0.00%	8 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #5660   +/-   ##
=======================================
  Coverage   36.16%   36.17%           
=======================================
  Files        1302     1302           
  Lines      109484   109492    +8     
=======================================
+ Hits        39600    39606    +6     
- Misses      65746    65748    +2     
  Partials     4138     4138           

Flag	Coverage Δ
unittests-datacatalog	51.37% <ø> (ø)
unittests-flyteadmin	55.33% <ø> (+0.03%)	⬆️
unittests-flytecopilot	12.17% <ø> (ø)
unittests-flytectl	62.28% <ø> (ø)
unittests-flyteidl	7.08% <0.00%> (-0.01%)	⬇️
unittests-flyteplugins	53.31% <ø> (ø)
unittests-flytepropeller	41.74% <ø> (ø)
unittests-flytestdlib	55.35% <ø> (ø)

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[katrogan]

@eapolinario okay to merge despite the codecov check?

[eapolinario]

@eapolinario okay to merge despite the codecov check?

yeah. Just merged. I'll cut a flyteidl release as soon as this lands.