feature: Ctx-aware axis label formatter (e.g. min/max, unified scaling)

Dear @epezent, first off, thanks again for maintaining such a lean and well-integrated plotting library — keep up the great work! :+1:

### Current behaviour

At present, `SetupAxisFormat(...)` only applies per-label formatting and lacks access to axis-level context (e.g. min/max range).
This makes it difficult to ensure coherent formatting across tick labels or to scale axis titles appropriately.

### Feature request

It would be helpful if this axis formatting could optionally take the axis and other contexts into account — particularly the range and scaling — to enable:

* a consistent number of significant digits across all tick labels
* a significant digits choice based on the axis pixel width (e.g. compress/shorten labels if necessary)
* automatic SI-prefix handling (e.g. k/M/G) applied once at the axis level, rather than individually per tick
* dynamic axis title labels that reflect the applied scaling, e.g. `current [kA]` or `frequency [GHz]`

Such a feature would significantly improve the clarity of scientific/engineering plots, especially those with multiple axes or large dynamic range.

Thanks for considering — and again, kudos for the excellent work! 🚀

### Examples

Here are a few illustrations of the desired behaviour: