Update signals-runtime to compile to es5

[silesky]

Transpile runtime code to es5 (no classes, etc)

[changeset-bot]

🦋 Changeset detected

Latest commit: 81d0886

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 2 packages

Name	Type
@segment/analytics-signals-runtime	Minor
@segment/analytics-signals	Patch

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.82%. Comparing base (d3b68e6) to head (81d0886).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1250   +/-   ##
=======================================
  Coverage   83.82%   83.82%           
=======================================
  Files         221      221           
  Lines        5861     5861           
  Branches     1337     1337           
=======================================
  Hits         4913     4913           
  Misses        948      948           

Flag	Coverage Δ
browser	92.22% <ø> (ø)
core	89.86% <ø> (ø)
node	87.93% <ø> (ø)

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