Trigger support for isolated model (out of proc)

[MaddyDev]

As part of out of proc support, we need to add trigger binding attribute metadata to the sql worker extension. Since right now we don't have the trigger implementation in main, add this as soon as it gets merged.

[Charles-Gagnon]

Do you need that to actually be in main? You can just use the triggerbindings branch and add it there after you're done with the input/output bindings.

[MaddyDev]

Yep I could do that as well once I get my changes in main

[MaddyDev]

#750 adds this.