feat(commands): ✨ Add history search command

[knoopx]

Introduced a new command for searching through message history. This feature allows users to quickly access previous commands and messages, enhancing usability.

• Added HistorySearchCommand to the command set.
• Implemented history completion provider to filter and display past commands.
• Integrated history search functionality into the editor component.

Closes #1701

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tldr: press ctrl-r for reverse history search, shell commands supported as well