Add actions to configure functions

[lstocchi]

it resolves #164

As in IJ, there are two actions (add/remove config) which allow users to add/remove env variables/volumes.

@evidolob @jeffmaury if any of you have some free time to review it, it would be great.

[codecov-commenter]

Codecov Report

Merging #174 (afc969a) into main (5a175dc) will increase coverage by 0.19%.
The diff coverage is 90.90%.

@@            Coverage Diff             @@
##             main     #174      +/-   ##
==========================================
+ Coverage   93.16%   93.35%   +0.19%     
==========================================
  Files          72       74       +2     
  Lines        2866     2888      +22     
  Branches      458      460       +2     
==========================================
+ Hits         2670     2696      +26     
+ Misses        196      192       -4     

Impacted Files	Coverage Δ
src/extension.ts	80.00% <50.00%> (-2.36%)	⬇️
src/cli/func-api.ts	70.00% <100.00%> (+4.09%)	⬆️
src/functions/function-command/add-env-function.ts	100.00% <100.00%> (ø)
.../functions/function-command/remove-env-function.ts	100.00% <100.00%> (ø)
src/util/watch.ts	96.66% <0.00%> (+3.33%)	⬆️
src/cli/cmdCli.ts	53.62% <0.00%> (+4.34%)	⬆️
src/util/platform.ts	100.00% <0.00%> (+11.76%)	⬆️

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[jeffmaury]

LGTM. Can't we have sub menus like in IntelliJ ?

[lstocchi]

Added submenus as in IJ. I also left the command from command palette.

[jeffmaury]

LGTM