Added support for advanced expressions

[colodenn]

This PR introduces support for advanced expressions such as:

number().defaultValue(() => op(5, '-', 3)),
string().check((fields) => op('Hello', '=', fields.stringConcat)),
string().defaultValue(() => sql("UPPER('test')")),
string().computedAs((fields) => ({
  kind: 'VIRTUAL',
  value: () => op(fields.numberAdd2, '||', fields.numberSubtract),
})),

However, there are still some missing type hints. We want to discourage expressions like:

number().defaultValue(() => op(5, '-', 3))

where database-level expressions are used inside default values. Instead, users should use:

number().defaultValue(() => 5 - 3)

so that the value is evaluated at runtime rather than by the database. This change ensures clearer separation between client-side evaluation and database-generated expressions, improving both type safety and overall code maintainability.

[github-actions]

Released an experimental package:

bun add @ronin/syntax@corny-ron-1099-1-experimental-89

This package will be removed after the pull request has been merged.

[colodenn]

This is a temporary solution and will be changed in a followup PR.