Change BatchSummaryCollector default y-axis scaling to independent axes

[jepegit]

Summary

Changes the default y-axis scaling behavior for BatchSummaryCollector from matching axes across subplots to independent axes.

Problem

The BatchSummaryCollector currently defaults to match_axes=True, which forces all subplots to share the same y-axis scale. This behavior is only suitable for specific plot combinations and is not appropriate for the majority of use cases where different variables (e.g., capacity, voltage, efficiency) have different scales.

Solution

Added _default_plotter_arguments to the BatchSummaryCollector class with match_axes set to False:

_default_plotter_arguments = {
    "match_axes": False,
}

Impact

• Better default behavior: Subplots will now have independent y-axes by default, making it easier to view multiple variables with different scales
• Backward compatible: Users who need matched axes can still get the old behavior by passing plotter_arguments={"match_axes": True}
• Scoped change: Only affects BatchSummaryCollector, not other collectors like BatchCyclesCollector or BatchICACollector

Testing

The change follows the existing pattern used by other collectors in the codebase (documented in the class-level comments about three levels of argument precedence).

Closes #391