feat: unify exposed types naming to colormap

[w1nklr]

Both colormap and colorMap naming scheme are present, bringing some confusion.
Moving to single notation: colormap.

Exposed part: exported API types
Rename:

• exposed types

Old types are exported as deprecated

Occurrence count, after and before the PR

	colormap	colorMap
Published Code (a)	618 results in 40 files 547 results in 38 files	143 results in 28 files 209 results in 33 files
Full Code (b)	767 results in 60 files 674 results in 57 files	267 results in 49 files 355 results in 54 files
Overall (c)	783 results in 66 files 692 results in 64 files	293 results in 58 files 381 results in 63 files

PR for #2581