Adopt argsCanBeInterpretedByShell

When a debug adapter uses RunInTerminalRequest, vscode is now escaping characters for the shell by default, but we added a flag to RunInTerminalRequest to allow debug adapters to disable this escaping, which some users want. A user pointe this out for java in https://github.com/microsoft/vscode/issues/160999. This is adopted in js-debug and python, and I'd love to see it adopted for java. In js-debug and python, the args property can be a string or an array of strings. If it's just a string, the args are not escaped. I can talk more about what it will take to adopt this if needed.

See
https://code.visualstudio.com/updates/v1_70#_argscanbeinterpretedbyshell-for-runinterminalrequest
and
https://github.com/microsoft/debug-adapter-protocol/issues/146