* Introduce simpliciations for extract/exclude-like conditional types and fix restrictive instantiations
* Add test for the common simplifications
* unify true branch constraint generation logic and true branch simplification
* Use identical check on instantiated types
* Add late-instantiate conditionals to test
* Globally cache conditional type instantiations ala indexed access types
* Handle `any` simplifications
* Factor empty intersection check into function
* Modifify conditional type constraints to better handle single-branch `any` and restrictive type parameters
* Add test case motivating prior commit
* Fix lint
* Factor logic into worker vs cacheing function
* Remove now unneeded casts
