feat: Add ServiceWorker utility class

[manueliglesias]

Issue #, if available:

Description of changes:

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license.

[codecov-io]

Codecov Report

Merging #831 into master will increase coverage by 0.04%.
The diff coverage is 90.32%.

@@            Coverage Diff             @@
##           master     #831      +/-   ##
==========================================
+ Coverage    87.7%   87.75%   +0.04%     
==========================================
  Files          75       77       +2     
  Lines        3604     3666      +62     
  Branches      684      693       +9     
==========================================
+ Hits         3161     3217      +56     
- Misses        420      426       +6     
  Partials       23       23

Impacted Files	Coverage Δ
packages/aws-amplify/src/Common/Amplify.ts	100% <100%> (ø)	⬆️
packages/aws-amplify/src/Common/index.ts	83.33% <100%> (+0.72%)	⬆️
...ages/aws-amplify/src/Common/ServiceWorker/index.ts	100% <100%> (ø)
...-amplify/src/Common/ServiceWorker/ServiceWorker.ts	89.83% <89.83%> (ø)

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[powerful23]

👍

[github-actions]

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