feat: Add symlog scale, scattermap zoom fix, and line dash support

[DhruvGarg111]

This PR addresses three issues:

1. Fixes [BUG]: Default zoom and center for scattermap traces does not show all points #7674 (Scattermap Zoom): Implemented auto-calculation for \zoom\ and \center\ in \scattermap\ traces when they are not provided by the user. It now computes the bounding box of the data and fits the map view accordingly.
2. Fixes add symmetrical log scale #221 (Symlog Scale): Added a new axis type \symlog\ (symmetrical log). This uses an \�sinh\ transformation to allow log-like scaling that passes smoothly through zero and handles negative numbers.
3. Fixes [Feature Request] Support line styles in Scattermapbox #6791 (Line Dash): Added support for \line.dash\ in \scattermap\ and \scattermapbox\ traces, mapping Plotly dash strings (e.g. 'dot', 'dashdot') to Mapbox's \line-dasharray\ format.

Changes:

• Modified \src/plots/map/layout_defaults.js\ for auto-bounds.
• Modified \src/plots/cartesian/set_convert.js\ and \layout_attributes.js\ for \symlog.
• Modified \�ttributes.js\ and \convert.js\ in \src/traces/scattermap\ and \src/traces/scattermapbox\ for dashed lines.