debugAdapter: add go module name check

[quoctruong]

This change modifies the extension to check for the go module name matching before setting a breakpoint. The bug this is trying to address (summed up by @hyangah):

In the go-guestbook sample, there are two go programs (frontend/main.go and backend/main.go).
They will start in separate containers - each of which builds main.go by copying the code into a work directory and running go build there. The frontend and the backend happen to be in different modules in this sample.

VS Code supports debugging two binaries together - a user can set breakpoints in both frontend/main.go and backend/main.go. VS Code by design sends breakpoint requests for all the files to all the debug adapters.

Since we cannot make any assumption on where the source code is copied in the remote container (i.e. in the sample, frontend/main.go is copied to /app/frontend/main.go, but it's also possible that the user just copy the source code to /app and build the binary from /app), the debug adapter tries to find the best match by doing some sort of longest suffix matching.

So, this longest suffix matching will end up associating /app/frontend/main.go on the remote frontend container with both frontend/main.go and backend/main.go in this specific example. As a result, the breakpoints set in backend/main.go will apply to the frontend/main.go.

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Patch Set 2:

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Patch Set 2:

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Patch Set 2:

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Patch Set 5: Run-TryBot+1

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Patch Set 6: Run-TryBot+1

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Patch Set 6:

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Patch Set 8: Run-TryBot+1 Code-Review+1 Trust+1

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[hyangah]

Thanks @quoctruong - I am currently cleaning up obsolete PRs.
As Cloud Code is planning to migrate to dlv dap, let's see if we can approach this issue in a different way (e.g. autopopulate substitutePath, etc)