Multiple queue consumers and dev engine URL changesets (#1949)

* add engine url changeset

* add queue consumer changeset

Author: nicktrn

.changeset/blue-eyes-tickle.md

@@ -0,0 +1,6 @@
+---
+"trigger.dev": patch
+"@trigger.dev/core": patch
+---
+
+The dev command will now use the platform-provided engine URL

.changeset/eighty-rings-divide.md

@@ -0,0 +1,5 @@
+---
+"@trigger.dev/core": patch
+---
+
+Configurable queue consumer count in supervisor session