feat(Variables): Add support for Terraform state file parsing

[bdwyertech]

Terraform state file is JSON. This would add support for cross-referencing Terraform outputs in serverless configuration.

custom:
  AlbListener:
    dev: ${file(./terraform.tfstate.d/${opt:region, 'us-east-1'}/terraform.tfstate):outputs.alblistener.value}

[codecov]

Codecov Report

Merging #8755 (ccf2d85) into master (30015ea) will increase coverage by 0.07%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master    #8755      +/-   ##
==========================================
+ Coverage   87.51%   87.59%   +0.07%     
==========================================
  Files         259      259              
  Lines        9628     9640      +12     
==========================================
+ Hits         8426     8444      +18     
+ Misses       1202     1196       -6     

Impacted Files	Coverage Δ
lib/utils/fs/parse.js	100.00% <100.00%> (ø)
lib/configSchema.js	100.00% <0.00%> (ø)
lib/plugins/aws/remove/lib/stack.js	100.00% <0.00%> (ø)
lib/classes/Variables.js	99.73% <0.00%> (+<0.01%)	⬆️
lib/plugins/aws/provider.js	93.09% <0.00%> (+0.02%)	⬆️
lib/plugins/aws/lib/updateStack.js	98.52% <0.00%> (+0.04%)	⬆️
lib/plugins/aws/deploy/lib/createStack.js	97.67% <0.00%> (+0.05%)	⬆️
lib/classes/Service.js	85.60% <0.00%> (+0.11%)	⬆️
...b/plugins/aws/package/compile/events/cloudFront.js	98.90% <0.00%> (+3.29%)	⬆️

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[pgrzesik]

Hello @bdwyertech, thanks for submitting your PR. Would you be willing to add a test case that covers this specific use case?

[bdwyertech]

Sure, I can give it a try.

…

On Thu, Jan 14, 2021, 3:56 AM Piotr Grzesik ***@***.***> wrote: ***@***.**** requested changes on this pull request. Hello @bdwyertech <https://github.com/bdwyertech>, thanks for submitting your PR. Would you be willing to add a test case that covers this specific use case? — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#8755 (review)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AAWV4WLWR45LRM7ST2GHFZ3SZ2WUXANCNFSM4WBNUXEQ> .

[bdwyertech]

Tests added @pgrzesik

[pgrzesik]

Thank you @bdwyertech, well done 👍