[lldb-dap] Add support for launching supported clients (#165941)

Support launching a supported DAP client using the lldb-dap binary.
Currently, only the official LLDB-DAP Visual Studio Code extension is
supported. It uses the VS Code launch URL format.

Here's an example:

```
lldb-dap --client vscode -- /path/to/exe foo bar
```

This will open the following URL with `code --open-url`:

```
vscode://llvm-vs-code-extensions.lldb-dap/start?program=/path/to/exe&args=foo&arg=bar
```

Fixes #125777

0 files changed, 0 insertions, 0 deletions