[Types] Move user.js to user.ts

[juliofarah]

Description

This PR

• Move user.js to user.ts
• Splits index.d.ts into two files (now global-modules.d.ts including jQuery and Zeptos definitions and global.d.ts including AnalyticsJs definitions)
• Removes private fields from Analytics.JS

Test plan

• Testing completed successfully make test-e2e and make watch-e2e:
  

Release plan

New version is not required because this is a dev-only change

[codecov-commenter]

Codecov Report

❗ No coverage uploaded for pull request base (master@344b9bc). Click here to learn what that means.
The diff coverage is n/a.

@@            Coverage Diff            @@
##             master     #172   +/-   ##
=========================================
  Coverage          ?   96.36%           
=========================================
  Files             ?        3           
  Lines             ?       55           
  Branches          ?        0           
=========================================
  Hits              ?       53           
  Misses            ?        2           
  Partials          ?        0           

Impacted Files	Coverage Δ
lib/utils/each.js	90.47% <0.00%> (ø)
lib/utils/map.js	100.00% <0.00%> (ø)
lib/utils/clone.js	100.00% <0.00%> (ø)

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