[Feature]: Add a FlagSet::empty() method

[jalil-salame]

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Description

Add a FlagSet::empty() -> Self method that returns an empty set.

This is more clear about the behavior/expected behavior than FlagSet::default(). I could imagine a FlagSet::default() implementation that returns a set with a predefined number of flags set.

Acceptance Criteria

Having a FlagSet::empty() method.

Suggestions for a technical implementation

Forward to the FlagSet::default() implementation.