fix(context): change copy cell command to make it work in SF

[ghiscoding]

• also simplified the code a lot with this new approach

[codecov]

Codecov Report

Merging #8 into master will decrease coverage by 0.01%.
The diff coverage is 100.00%.

@@            Coverage Diff             @@
##           master       #8      +/-   ##
==========================================
- Coverage   95.40%   95.39%   -0.00%     
==========================================
  Files         183      183              
  Lines        9765     9759       -6     
  Branches     3325     3324       -1     
==========================================
- Hits         9315     9309       -6     
  Misses        450      450              

Impacted Files	Coverage Δ
...ages/common/src/extensions/contextMenuExtension.ts	100.00% <100.00%> (ø)

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