Ignore defaults in schema when validating

[jonurry]

The input schema generator performs some validations like checking that types and descriptions exist etc...
It currently treats defaults like any other schema elements and therefore can raise validation issue that are not valid.
e.g. in the data-mapper connector, the map_one_value operation has a default value for the mappings input of:

default: [
	{
		type: 'object',
		value: {
			from: {
				type: 'string',
				value: '',
			},
			to: {
				type: 'string',
				value: '',
			},
		},
	},
],

This issues the following validation errors:

┌─────────┬─────────────────────────────────────────────┬───────────┬─────────────┬────────────────────┐
│ (index) │                     key                     │   type    │ description │ ending punctuation │
├─────────┼─────────────────────────────────────────────┼───────────┼─────────────┼────────────────────┤
│    0    │   'map_one_value.mappings.default.value'    │ 'missing' │             │                    │
│    1    │   'map_one_value.mappings.default.value'    │           │  'missing'  │                    │
│    2    │ 'map_one_value.mappings.default.value.from' │           │  'missing'  │                    │
│    3    │  'map_one_value.mappings.default.value.to'  │           │  'missing'  │                    │
└─────────┴─────────────────────────────────────────────┴───────────┴─────────────┴────────────────────┘

There should be no errors because the default values are not schema declarations, they are just values.