Implement a basic benchmark test, and deprecate derivation.map()/flatMap()

This starts a new workspace at `packages/benchmarks` where future benchmarks
are going to sit. For now, it only contains a basic profile of a `sequence.play()`
setup.

It also removes all uses of `AbstractDerivation.map()/flatMap()` and uses prisms
instead.

devEnv/typecheck-all-projects/tsconfig.all.json

@@ -9,6 +9,7 @@
     {"path": "../../theatre"},
     {"path": "../../packages/dataverse"},
     {"path": "../../packages/playground"},
+    {"path": "../../packages/benchmarks"},
     {"path": "../../packages/r3f"},
     {"path": "../../examples/basic-dom"}
   ]