embed actors v8 bundle

build/builtin-actors/README.md

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+This directory contains the builtin actors v8 bundle, to be emdedded in the binary.
+To change your actor bundle, prior to fixing for nv16 upgrade, generate a bundle using the actor
+bundler and place it in this directory, in a file named builtin-actors-v8.car

build/builtin_actors.go

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+package build
+
+import (
+	_ "embed"
+)
+
+//go:embed builtin-actors/builtin-actors-v8.car
+var actorsv8 []byte
+
+func BuiltinActorsV8Bundle() []byte {
+	return actorsv8
+}