drop deprecated `transforms` in v3

[archmoj]

plotly.js/src/plots/attributes.js

Lines 217 to 225 in 206d117

	transforms: {
	_isLinkedToArray: 'transform',
	editType: 'calc',
	description: [
	'WARNING: All transforms are deprecated and may be removed from the API in next major version.',
	'An array of operations that manipulate the trace data,',
	'for example filtering or sorting the data arrays.'
	].join(' ')
	},

[gvwilson]

Make it so. cc @archmoj