Support serde attributes

[msrd0]

These seem to be the relevant attributes from https://serde.rs:

• Container Attributes
  • rename
  • rename_all
  • deny_unknown_fields
  • tag / content / untagged
  • default (this might not be usable unless we force a Serialize type bound)
  • transparent
  • from / try_from / into
• Variant Attributes
  • rename
  • rename_all
  • skip*
  • other (unsure about whether this should be in the spec at all, or if the default tag is already good enough for catchall-variants)
• Field Attributes
  • rename
  • default / skip*
  • flatten
  • with* (unsure how to handle these - do we expect a visit_type method alongside the (de)serialize methods?)