feat: Add timezone picker

[maze-runnar]

Fixes #4734

Short description of what this resolves:

Display timezone on public event page

Checklist

• I have read the Contribution & Best practices Guide.
• My branch is up-to-date with the Upstream development branch.
• The acceptance, integration, unit tests and linter pass locally with my changes
• I have added tests that prove my fix is effective or that my feature works
• I have added necessary documentation (if appropriate)

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[iamareebjamal]

• It should say Europe/Paris (Event) and Asia/Kolkata (Local)
• Event timezone should be the default selected, not local timezone
• Local timezone should be the first option in dropdown

[codecov]

Codecov Report

Merging #4860 into development will increase coverage by 0.06%.
The diff coverage is 20.00%.

@@               Coverage Diff               @@
##           development    #4860      +/-   ##
===============================================
+ Coverage        23.29%   23.35%   +0.06%     
===============================================
  Files              480      481       +1     
  Lines             5086     5090       +4     
  Branches            17       18       +1     
===============================================
+ Hits              1185     1189       +4     
  Misses            3897     3897              
  Partials             4        4              

Impacted Files	Coverage Δ
app/components/schedule.ts	65.85% <ø> (ø)
app/controllers/public/sessions.js	0.00% <0.00%> (ø)
app/utils/dictionary/date-time.ts	100.00% <ø> (ø)
app/components/widgets/time-zone-picker.ts	33.33% <33.33%> (ø)
app/components/tabbed-navigation.js	53.33% <0.00%> (+20.00%)	⬆️

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[maze-runnar]

[iamareebjamal]

This should be event timezone by default, not local timezone

[maze-runnar]

Session page drop down is showing event timezone by default, not local timezone

[maze-runnar]

currentTimezone = moment.tz.guess();

this line is for in other condition current timezone, other than event timezone. I can initialize it with any walue of time, session page will show same event timezone by default