Allow screen events to have source middleware applied

[silesky]

addresses #1211

[changeset-bot]

🦋 Changeset detected

Latest commit: 64ad0f5

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

This PR includes changesets to release 1 package

Name	Type
@segment/analytics-next	Patch

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.92%. Comparing base (7f9d5a0) to head (64ad0f5).
Report is 1 commits behind head on master.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1213   +/-   ##
=======================================
  Coverage   82.92%   82.92%           
=======================================
  Files         216      216           
  Lines        5785     5785           
  Branches     1308     1308           
=======================================
  Hits         4797     4797           
  Misses        988      988           

Flag	Coverage Δ
browser	92.23% <ø> (ø)
core	89.86% <ø> (ø)
node	87.93% <ø> (ø)

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