Add isEmpty and isNotEmpty utility methods #4
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This PR adds two new (terminal) methods:
isEmptythat checks whether the sequence contains absolutely no elementisNotEmptythat checks whether the sequence contains at least one elementBoth are implemented in the laziest way possible and are compatible with (potentially) infinite sequences as their source.
This PR is based on winterbe/sequency#37 and adapted to the current project structure.
This PR description was generated by AI using GitHub MCP