Quotation marks in launch.json

[eneuschild]

Context

With the original contrib/ide/vscode/launch.json, I get the following error when trying to "Launch (with SQLite3)":

named files must be .go files: sqlite_unlock_notify"
exit status 1
Process exiting with code: 1

This is on Ubuntu Linux.

Fix

Using single quotation marks instead of escaped double quotes fixes the problem.

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Additionally, the added settings.json allows running single unit tests through the Go extension.

I figured both changes are small enough to fit into one PR. ;)

[codecov-io]

Codecov Report

Merging #13325 into master will decrease coverage by 0.00%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master   #13325      +/-   ##
==========================================
- Coverage   42.13%   42.12%   -0.01%     
==========================================
  Files         689      689              
  Lines       75845    75845              
==========================================
- Hits        31956    31952       -4     
- Misses      38658    38661       +3     
- Partials     5231     5232       +1     

Impacted Files	Coverage Δ
modules/charset/charset.go	68.53% <0.00%> (-4.50%)	⬇️

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