[lldb-dap] Add stdio redirection for integrated and external terminals (#161089) This patch extends stdio redirection support to integrated and external terminals. Currently, these cases are not covered by the standard logic because `attach` is used instead of `launch`. To be honest, `runInTerminal` in [VSCode](https://github.com/microsoft/vscode/blob/main/src/vs/workbench/contrib/debug/node/terminals.ts#L188) request supports `>` and `<` for redirection, but not `2>`. We could use the `argsCanBeInterpretedByShell` option to use full power of shell, however it requieres proper escaping of arguments on lldb-dap side. So, I think it will be better to have the only one option to control stdio redirection that works consistently across all console modes. Also, fixed a small typo in a comparison that was leading to out-of-bound access, and added `null` as a possible value for `stdio` array in package.json.
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