[lldb-dap] Add testcases for stdio redirection on different console types. (#175048)
There are some bugs when launching in terminal with args and stdio
redirection.
- lldb-dap `--stdio` args is passed to the debuggee (should we change
this to use `--` to separate debuggee args from lldb-dap args, similar
to how we handle the `--client` args? ).
#### It also changes the behaviour of stdio redirection.
If a redirection is not specified, it uses to lldb default value. e.g.
```jsonc
"stdio": ["./stdin"]`
// now becomes
"stdio", ["./stdio", "./default_stdout", "./default_stderr"]
// instead of
"stdio", ["./stdin", "./stdin", "./stdin"]
// took quite some time to figure out where my output is going to.
```
Fixes [#174445](https://github.com/llvm/llvm-project/issues/174445)
Other bug I noticed but should be in a different PR.
- debuggee args that contains newline are not properly escaped when sent
to the terminal.
llvm-project
c745e9b6 - [lldb-dap] Add testcases for stdio redirection on different console types. (#175048)
