Adding support opentelemtry to enable performance observability

[hamersaw]

TL;DR

This PR adds wrappers over the opentelementry framework to support exporting distributed traces from Flyte components. The goal is to instrument Flyte microservices to improve performance observability.

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

[codecov]

Codecov Report

Merging #149 (1810069) into master (80d1624) will increase coverage by 0.28%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #149      +/-   ##
==========================================
+ Coverage   67.94%   68.23%   +0.28%     
==========================================
  Files          69       69              
  Lines        4077     4089      +12     
==========================================
+ Hits         2770     2790      +20     
+ Misses       1148     1141       -7     
+ Partials      159      158       -1     

Flag	Coverage Δ
unittests	68.23% <100.00%> (+0.28%)	⬆️

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

Impacted Files	Coverage Δ
storage/cached_rawstore.go	77.10% <100.00%> (+1.78%)	⬆️
storage/protobuf_store.go	74.19% <100.00%> (+2.76%)	⬆️
cache/auto_refresh.go	77.85% <0.00%> (+5.36%)	⬆️

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[hamersaw]

closed in favor of #146