Adding utils for signal ID context

[hamersaw]

TL;DR

With the additional of the signal service in FlyteAdmin we may want to track metrics on a per-signal basis. To do this we need to set the signal ID on the context.

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#208

Follow-up issue

NA

[codecov]

Codecov Report

Merging #137 (6368b4f) into master (1279ea2) will increase coverage by 0.04%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master     #137      +/-   ##
==========================================
+ Coverage   68.75%   68.79%   +0.04%     
==========================================
  Files          69       69              
  Lines        3405     3407       +2     
==========================================
+ Hits         2341     2344       +3     
+ Misses        905      904       -1     
  Partials      159      159              

Flag	Coverage Δ
unittests	67.66% <100.00%> (+0.04%)	⬆️

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

Impacted Files	Coverage Δ
contextutils/context.go	82.08% <100.00%> (+0.55%)	⬆️
sets/generic_set.go	100.00% <0.00%> (+1.08%)	⬆️

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