Logger support for multiple compilations

[matt-gadd]

Type: bug

The following has been addressed in the PR:

• There is a related issue
• All code has been formatted with prettier
• Unit or Functional tests are included in the PR
• schema.json has been updated appopriately

Description:
The logger currently breaks when used with multiple compilations. This fixes it so the first compilation is deemed the main compilation (used for output path etc), but chunks are still reported from all compilations.

[codecov]

Codecov Report

Merging #357 into master will increase coverage by 0.15%.
The diff coverage is 88.88%.

@@            Coverage Diff             @@
##           master     #357      +/-   ##
==========================================
+ Coverage   48.62%   48.77%   +0.15%     
==========================================
  Files          10       10              
  Lines         689      693       +4     
  Branches      193      196       +3     
==========================================
+ Hits          335      338       +3     
- Misses        354      355       +1

Impacted Files	Coverage Δ
src/logger.ts	96.36% <88.88%> (-1.68%)	⬇️

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