feat(Icon): Adding lightning icon for Teams theme

[notandrew]

Adding lightning icon:

[codecov]

Codecov Report

Merging #1385 into master will increase coverage by <.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #1385      +/-   ##
==========================================
+ Coverage   73.47%   73.47%   +<.01%     
==========================================
  Files         777      778       +1     
  Lines        5858     5859       +1     
  Branches     1706     1726      +20     
==========================================
+ Hits         4304     4305       +1     
  Misses       1548     1548              
  Partials        6        6

Impacted Files	Coverage Δ
...emes/teams/components/Icon/svg/icons/lightning.tsx	100% <100%> (ø)

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[kuzhelov]

looks good to me :) just one thing to ensure before merge - was this icon verified by designers? @codepretty