Support different debug config for different launch targets

[RichardLuo0]

This changes the behaviour

The following changes are proposed:

• Allow command substitution launchTagetsXXX and getLaunchTagetsXXX to accept target name

The purpose of this change

If there are multiple targets in the project, this pr allows using different configs for different targets.
An example launch.json:

{
  "configurations": [
    {
      "name": "Debug a",
      "type": "cppdbg",
      "request": "launch",
      "program": "${input:target-a}",
      "cwd": "${workspaceFolder}",
    },
    {
      "name": "Test a",
      "type": "cppdbg",
      "request": "launch",
      "program": "${input:target-a-test}",
      "cwd": "${workspaceFolder}",
      "args": [
          "--gtest_filter=a.example"
      ],
    },
    {
      "name": "Debug subproject",
      "type": "cppdbg",
      "request": "launch",
      "program": "${input:target-subproject}",
      "cwd": "${workspaceFolder}",
      "args": [
          "-xxxx"
      ],
    },
  ],
  "inputs": [
    {
      "id": "target-a",
      "type": "command",
      "command": "cmake.launchTargetPath",
      "args": {
        "targetName": "a"
       }
    },
    {
      "id": "target-a-test",
      "type": "command",
      "command": "cmake.launchTargetPath",
      "args": {
        "targetName": "a-test"
      }
    },
    {
      "id": "target-subproject",
      "type": "command",
      "command": "cmake.launchTargetPath",
      "args": {
        "targetName": "subproject"
      }
    }
  ]
}

[RichardLuo0]

@microsoft-github-policy-service agree [company="default"]

[RichardLuo0]

@microsoft-github-policy-service agree company="default"

[bobbrow]

Thank you for the PR! We will take a look in the next few days and let you know if we have any feedback. Please also add a short description of the change in CHANGELOG.md and give yourself credit for your work.

[gcampbell-msft]

@RichardLuo0 This PR looks reasonable to me! Could you update to most recent main and fix the changelog conflict?

You'll want to make a new section in the changelog for the next release which will be 1.16. Thanks for the contribution!

[gcampbell-msft]

Great! Thanks for your updates and contribution!

Approving and then merging pending tests passing.