open func.yaml file when clicking on tree view

[sudhirverma]

Fix: #191

[codecov-commenter]

Codecov Report

Merging #258 (10cc69e) into main (a04c63d) will decrease coverage by 0.30%.
The diff coverage is 29.41%.

@@            Coverage Diff             @@
##             main     #258      +/-   ##
==========================================
- Coverage   85.22%   84.91%   -0.31%     
==========================================
  Files          77       78       +1     
  Lines        3140     3156      +16     
  Branches      531      534       +3     
==========================================
+ Hits         2676     2680       +4     
- Misses        464      476      +12     

Impacted Files	Coverage Δ
.../functions/function-tree-view/functionsTreeItem.ts	33.89% <20.00%> (-2.47%)	⬇️
...tions/function-command/open-yaml-file-in-editor.ts	30.00% <30.00%> (ø)
src/extension.ts	71.21% <50.00%> (-0.67%)	⬇️

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[lstocchi]

LGTM