customize endpointId

[powerful23]

Issue #, if available:
Enable users to customize the endpoint id in Analytics
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 #421 into master will decrease coverage by 0.03%.
The diff coverage is 75%.

@@            Coverage Diff             @@
##           master     #421      +/-   ##
==========================================
- Coverage   91.29%   91.26%   -0.04%     
==========================================
  Files          56       56              
  Lines        2687     2689       +2     
  Branches      538      538              
==========================================
+ Hits         2453     2454       +1     
- Misses        222      223       +1     
  Partials       12       12

Impacted Files	Coverage Δ
packages/aws-amplify/src/Analytics/Analytics.ts	94.11% <100%> (+0.07%)	⬆️
...fy/src/Analytics/Providers/AWSAnalyticsProvider.ts	97.2% <50%> (-0.69%)	⬇️

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[mlabieniec]

👍

[github-actions]

This pull request has been automatically locked since there hasn't been any recent activity after it was closed. Please open a new issue for related bugs.

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