LLDB rejects arguments properties with a dash when using `settings set`

```
(lldb) settings set target.run-args -foo bar
˄˜˜˜
╰─ error: unknown or ambiguous option
(lldb) settings set target.run-args "-foo"
˄˜˜˜
╰─ error: unknown or ambiguous option
```

Reproduce the two `settings set target.run-args` commands shown in the issue and inspect LLDB's command parsing for settings values beginning with a dash. Trace how `target.run-args` arguments are parsed, then verify that both quoted and unquoted dash-prefixed values are accepted without the unknown-or-ambiguous-option error.

Written by the indexing model from the issue text.