Update schemars from 0.8 to 1.0

[link2xt]

This requires some migration: https://graham.cool/schemars/migrating/

Turns out we did not test schemars in CI, so I pushed change enabling "openrpc" feature in CI: https://github.com/chatmail/yerpc/commit/8f85557b9a9a0ba4dc873aac81132cc5e2011e70

Now this PR fails CI because API usage was not migrated.