Falsy default values are not displayed

[P0lip]

Describe the bug

Falsy default values aren't currently displayed and are entirely ignored.

To Reproduce

1. Given any schema model with a falsy default value

{
  "type": "number",
  "default": 0
}

2. It's not rendered

Expected behavior

They are displayed in the same as any other value.

Additional context

Caused by https://github.com/stoplightio/json-schema-viewer/blob/master/src/components/shared/Validations.tsx#L229
This correct code should look more or less as follows

     ...('default' in schemaNode.annotations ? { default: JSON.stringify(schemaNode.annotations.default) } : null),

Screenshots

[raleigh04]

add medium label