[lldb-dap] Correct auto-completion based on ReplMode and escape char (#110784) This commit improves the auto-completion in the Debug Console provided by VS-Code. So far, we were always suggesting completions for both LLDB commands and for variables / expressions, even if the heuristic already determined how the given string will be executed, e.g., because the user explicitly typed the escape prefix. Furthermore, auto-completion after the escape character was broken, since the offsets were not adjusted correctly. With this commit we now correctly take this into account. Even with this commit, auto-completion does not always work reliably: * VS Code only requests auto-completion after typing the first alphabetic character, but not after punctuation characters. This means that no completions are provided after typing "`" * LLDB does not provide autocompletions if a string is an exact match. This means if a user types `l` (which is a valid command), LLDB will not provide "language" and "log" as potential completions. Even worse, VS Code caches the completion and does client-side filtering. Hence, even after typing `la`, no auto-completion for "language" is shown in the UI. Those issues might be fixed in follow-up commits. Also with those known issues, the experience is already much better with this commit. Furthermore, I updated the README since I noticed that it was slightly inaccurate.
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