feat: etag support

[alexander-akait]

This PR contains a:

• bugfix
• new feature
• code refactor
• test update
• documentation update
• typo fix
• metadata update

Motivation / Use-Case

Support ETag generation

fixes #738
fixes #746

Breaking Changes

No

Additional Info

No

[codecov]

Codecov Report

Attention: Patch coverage is 84.78261% with 21 lines in your changes are missing coverage. Please review.

Project coverage is 93.20%. Comparing base (f69b638) to head (448d76b).

Files	Patch %	Lines
src/utils/parseTokenList.js	54.16%	9 Missing and 2 partials ⚠️
src/middleware.js	89.15%	6 Missing and 3 partials ⚠️
src/utils/etag.js	96.77%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #1797      +/-   ##
==========================================
- Coverage   95.55%   93.20%   -2.35%     
==========================================
  Files          10       12       +2     
  Lines         495      633     +138     
  Branches      135      187      +52     
==========================================
+ Hits          473      590     +117     
- Misses         21       37      +16     
- Partials        1        6       +5     

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