feat: Token file web identity credentials

[trivikr]

Checklist

• npm run test passes
• .d.ts file is updated
• changelog is added, npm run add-change

[codecov-io]

Codecov Report

Merging #2737 into master will increase coverage by 0.03%.
The diff coverage is 95.52%.

@@            Coverage Diff             @@
##           master    #2737      +/-   ##
==========================================
+ Coverage   96.89%   96.92%   +0.03%     
==========================================
  Files         289      297       +8     
  Lines        8755     8888     +133     
  Branches     1648     1662      +14     
==========================================
+ Hits         8483     8615     +132     
- Misses        272      273       +1

Impacted Files	Coverage Δ
lib/credentials/process_credentials.js	100% <100%> (+3.44%)	⬆️
lib/credentials/shared_ini_file_credentials.js	97.61% <100%> (-0.26%)	⬇️
lib/util.js	94.71% <100%> (+0.14%)	⬆️
lib/node_loader.js	90% <50%> (-1.18%)	⬇️
...credentials/token_file_web_identity_credentials.js	96% <96%> (ø)
lib/publisher/index.js	100% <0%> (ø)	⬆️
lib/publisher/configuration.js	100% <0%> (ø)	⬆️
lib/s3/managed_upload.js	94.05% <0%> (ø)	⬆️
lib/credentials/chainable_temporary_credentials.js	100% <0%> (ø)	⬆️
clients/applicationinsights.js	100% <0%> (ø)
... and 7 more

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[AllanZhengYP]

The Node10 test failed in Travic because your unit tests were run in browser tests. You can get rid of them by only run you tests in Node tests like here

[AllanZhengYP]

Nice. I don't have more feedback 👍. Just a reminder, we also need a d.ts file for the credential provider. Other than this, this PR looks good to me.

[trivikr]

The typings were added in commit e3086ce

[AllanZhengYP]

Approve again!

[lock]

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