Add common code editors's features in command entry
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Description

It's very usefull to bring some features, widely distributed in code editors, such as indent saving, multicursor, etc to command entry (some Cantor's competitors (Jupyter, for example) have this features).

sirgienko triaged this task as Normal priority.

Some update for this task in https://invent.kde.org/education/cantor/-/commit/afb5d04bd6787c81deae918b60b971425f8ded40
Now tabulation works proper and allow you change not only indent of your current line but also change indent for intire selection.