Added variable popup

[DigneshGujarathi]

Summary

Test Plan

[codecov-io]

Codecov Report

Merging #825 (48e3e2f) into master (333b244) will decrease coverage by 0.28%.
The diff coverage is 50.57%.

@@            Coverage Diff             @@
##           master     #825      +/-   ##
==========================================
- Coverage   70.00%   69.71%   -0.29%     
==========================================
  Files         141      142       +1     
  Lines        3624     3702      +78     
  Branches      738      750      +12     
==========================================
+ Hits         2537     2581      +44     
- Misses        835      863      +28     
- Partials      252      258       +6     

Impacted Files	Coverage Δ
src/containers/Chat/ChatMessages/ChatMessages.tsx	48.12% <0.00%> (-1.50%)	⬇️
...ntainers/Chat/ChatMessages/ChatInput/ChatInput.tsx	65.15% <39.53%> (-7.49%)	⬇️
...rs/Chat/ChatMessages/AddVariables/AddVariables.tsx	65.71% <65.71%> (ø)
src/common/constants.ts	100.00% <100.00%> (ø)
src/components/UI/DialogBox/DialogBox.tsx	93.10% <100.00%> (+0.24%)	⬆️
...mponents/UI/Form/WhatsAppEditor/WhatsAppEditor.tsx	62.50% <100.00%> (ø)
...ntact/BlockContactList/BlockContact.test.helper.ts	100.00% <100.00%> (ø)
...BlockContact/BlockContactList/BlockContactList.tsx	96.55% <0.00%> (+6.89%)	⬆️

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[mdshamoon]

Testing feedbacks:

1. The default height of chat Input is increased. This is affecting the alignment of icons and the placeholder.

2. If a template has no variable, it's treating it like a normal message in the chat input field and we are able to edit that.

[mdshamoon]

Testing feedback:

Account update template has 3 variables but in the dialog box, it's showing only one.

[mdshamoon]

Looks good.