Migrate to `seroval` for serialization

[lxsmnsyc]

This is meant to be an experiment that may prove to be useful.

Fixes #201

Notes:

• In the future, seroval may support Iterable and AsyncIterable (through serializeAsync) although there isn't really a need for serializeAsync for dom-expressions
  • Already in https://github.com/lxsmnsyc/seroval/pull/2 (except AsyncIterable)
• I could also probably move the Error serialization to seroval instead.
  • Already in https://github.com/lxsmnsyc/seroval/pull/2
• I also noticed that devalue is still a dependency even though DX isn't using it so I removed it.
• NPM lockfiles are still untouched for now.