Creator tax compliance (#4254)

* Initial implementation

* Remove test code

* Query cache

* Appease clippy

* Precise TIN/SSN

* Make tax threshold customizable via env variable

* Address review comments

apps/labrinth/src/util/mod.rs

@@ -1,5 +1,6 @@
 pub mod actix;
 pub mod archon;
+pub mod avalara1099;
 pub mod bitflag;
 pub mod captcha;
 pub mod cors;