Transform metadata to fix

[kevinyamauchi]

Some aspects of the current transform metadata is not compliant with the RFC-5 transformations:

• Multiscales - remove "axes" from top level

  ngff-transformations/examples/.zattrs

  Lines 3 to 17 in b78121e

  	{
  	"axes": [
  	{
  	"name": "c",
  	"type": "channel"
  	},
  	{
  	"name": "y",
  	"type": "space"
  	},
  	{
  	"name": "x",
  	"type": "space"
  	}
  	],

• input/output coordinate systems should not be inside transformation:

  ngff-transformations/examples/.zattrs

  Lines 40 to 75 in b78121e

  	"input": {
  	"axes": [
  	{
  	"name": "c",
  	"type": "channel"
  	},
  	{
  	"name": "y",
  	"type": "space",
  	"unit": "unit"
  	},
  	{
  	"name": "x",
  	"type": "space",
  	"unit": "unit"
  	}
  	],
  	"name": "cyx"
  	},
  	"output": {
  	"axes": [
  	{
  	"name": "c",
  	"type": "channel"
  	},
  	{
  	"name": "x",
  	"type": "space",
  	"unit": "unit"
  	},
  	{
  	"name": "y",
  	"type": "space",
  	"unit": "unit"
  	}
  	],

• intrinsic coordinate system should have path:

  ngff-transformations/examples/.zattrs

  Line 98 in b78121e

  "name": "cyx"

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