`Grid` and `MultiAxis` related naming

[andiwand]

While working on the MultiAxis implementation I stumbled over a few potentially suboptimal names

1. global bin and local bins
   • bin is actually an index - we could call it that way
   • global / local is a loaded term in ACTS and usually refers to different coordinate systems
   • my suggestion here would be something like flat index or linear index and multi index
2. for Axis we use getX while for Grid we use x
3. lower left edge / upper right edge
   • I believe this should rather be corner
4. position vs point

[baraafanah21]

Hi! I'd like to work on this. To keep PRs small and reviewable, I'd propose splitting it into separate PRs per item, starting with item 2 (the getX vs x consistency between Axis and Grid) since it seems the most self-contained.
Two questions before I start:

For the renames, should old names be kept as [[deprecated]] aliases for a transition period, or is a clean break acceptable here?
For item 1, are flatIndex / multiIndex the agreed-on names, or is that still open for discussion?

Since you're actively working on the MultiAxis implementation, happy to coordinate to avoid conflicts

[andiwand]

Hi @baraafanah21 !

As you say, this work should be based on

• feat: Extract MultiAxis from Grid #5531
• refactor: Deprecate duplicated binning API on Grid/IGrid/AnyGridView #5645
  to avoid conflicts.

If you want to contribute here we are happy to guide you and provide feedback.

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