Add support for multi proc using new python debug adapter

[karthiknadig]

For #8105

• Pull request represents a single change (i.e. not fixing disparate/unrelated things in a single PR)
• Title summarizes what is changing
• Has a news entry file (remember to thank yourself!)
• Appropriate comments and documentation strings in the code
• Unit tests & system/integration tests are added/updated

[codecov-io]

Codecov Report

Merging #8340 into master will increase coverage by 0.01%.
The diff coverage is 100%.

@@            Coverage Diff             @@
##           master    #8340      +/-   ##
==========================================
+ Coverage   59.39%   59.41%   +0.01%     
==========================================
  Files         509      509              
  Lines       23422    23431       +9     
  Branches     3786     3790       +4     
==========================================
+ Hits        13912    13921       +9     
  Misses       8604     8604              
  Partials      906      906

Impacted Files	Coverage Δ
src/client/debugger/extension/hooks/types.ts	100% <ø> (ø)	⬆️
src/client/debugger/types.ts	100% <ø> (ø)	⬆️
src/client/debugger/extension/hooks/constants.ts	100% <100%> (ø)	⬆️
...ugger/extension/hooks/childProcessAttachHandler.ts	100% <100%> (ø)	⬆️
...ugger/extension/hooks/childProcessAttachService.ts	100% <100%> (ø)	⬆️

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