fix: rework bindable types strategy#2361
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Instead of using types that declare whether or not a type is bindable directly as part of the property, we're introducing a new for-types-only field to `SvelteComponent`: `$$bindings`, which is typed as the keys of the properties that are bindable (string by default, i.e. everything's bindable; for backwards compat). language-tools can then produce code that assigns to this property which results in an error we can display if the binding is invalid. This means we can revert a lot of the changes we made to make the previous version of bindable types work
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Instead of using types that declare whether or not a type is bindable directly as part of the property, we're introducing a new for-types-only field to
SvelteComponent:$$bindings, which is typed as the keys of the properties that are bindable (string by default, i.e. everything's bindable; for backwards compat). language-tools can then produce code that assigns to this property which results in an error we can display if the binding is invalid. This means we can revert a lot of the changes we made to make the previous version of bindable types work