Add a Package Extension to support FileIO

[TimG1964]

Requires a new release of FileIO, merging FileIO PR #439. The FileIOExt test coverage depends on the FileIO PR being merged.

[codecov-commenter]

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Codecov Report

❌ Patch coverage is 58.82353% with 21 lines in your changes missing coverage. Please review.
✅ Project coverage is 94.94%. Comparing base (fcdba31) to head (a98dd44).
⚠️ Report is 50 commits behind head on master.

Files with missing lines	Patch %	Lines
ext/FileIOExt.jl	0.00%	17 Missing ⚠️
src/read.jl	87.50%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #408      +/-   ##
==========================================
+ Coverage   94.62%   94.94%   +0.31%     
==========================================
  Files          21       23       +2     
  Lines        7056     7575     +519     
==========================================
+ Hits         6677     7192     +515     
- Misses        379      383       +4     

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