Load assembly event

[304NotModified]

Event before an assembly is loaded. Loading the assembly could be skipped for performance or (poor man's) security checks.

Fixes #1530, build on #1917

event is static because:

• it's needed before ConfigurationItemFactory is build
• it should not be cleared because there is a new ConfigurationItemFactory

[codecov-io]

Codecov Report

❗ No coverage uploaded for pull request base (master@0f4d2e3). Click here to learn what that means.
The diff coverage is 100%.

@@           Coverage Diff            @@
##             master   #2009   +/-   ##
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  Coverage          ?     82%           
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  Files             ?     286           
  Lines             ?   19642           
  Branches          ?    2295           
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  Hits              ?   16033           
  Misses            ?    3041           
  Partials          ?     568

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