Add ETag support for file library

[marschall]

Fixes #1324

[marschall]

Requires SeasideSt/Grease#140

[jbrichau]

The annoying situation here is that GemStone uses https://github.com/GsDevKit/Grease instead of the SeasideSt/Grease... which is why the tests are still failing (at least).
Will do the PR to GsDevKit to ping Dale.

[astares]

Any update on this?

[jbrichau]

Any update on this?

I will take a look why the tests are failing for GemStone

[codecov]

Codecov Report

Patch coverage: 89.58% and project coverage change: +0.01% 🎉

Comparison is base (c152487) 54.44% compared to head (95d0f2e) 54.46%.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1325      +/-   ##
==========================================
+ Coverage   54.44%   54.46%   +0.01%     
==========================================
  Files        8833     8837       +4     
  Lines       71719    71759      +40     
==========================================
+ Hits        39045    39080      +35     
- Misses      32674    32679       +5     

Files Changed	Coverage Δ
...e.package/WAResponse.class/instance/notModified.st	0.00% <0.00%> (ø)
...bstractFileLibrary.class/instance/entityTagFor..st	100.00% <100.00%> (ø)
...re.package/WAFileLibrary.class/instance/handle..st	100.00% <100.00%> (ø)
...ge/WAFileMetadataLibrary.class/instance/handle..st	100.00% <100.00%> (ø)
...re.package/WARequest.class/instance/ifNoneMatch.st	100.00% <100.00%> (ø)
...re.package/WAResponse.class/instance/entityTag..st	100.00% <100.00%> (ø)

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