docs(changeset): Fix bug where creating the build object also initial…

…ized it; this is incorrect since if you just want the build object you don't necessarily want to register all of the GraphQL types (and potentially discover naming conflicts) at that moment. Introduced new `schemaBuilder.initBuild(schemaBuilder.createBuild(input))` API to explicitly handle initing if you need an initialized build object.

.changeset/good-rocks-deny.md

@@ -0,0 +1,10 @@
+---
+"graphile-build": patch
+---
+
+Fix bug where creating the build object also initialized it; this is incorrect
+since if you just want the build object you don't necessarily want to register
+all of the GraphQL types (and potentially discover naming conflicts) at that
+moment. Introduced new
+`schemaBuilder.initBuild(schemaBuilder.createBuild(input))` API to explicitly
+handle initing if you need an initialized build object.