prepare release 1.16.0-rc.1 (#435)

Pre-release (release candidate) to validate the npm-consumed kernel
(@databricks/databricks-sql-kernel 0.2.0) end-to-end before GA. Publishes
to the 'next' dist-tag; latest stays 1.15.0.

Co-authored-by: Isaac

Signed-off-by: Madhavendra Rathore <madhavendra.rathore@databricks.com>

Author: msrathore-db

package-lock.json

@@ -1,6 +1,6 @@
 {
   "name": "@databricks/sql",
-  "version": "1.15.0",
+  "version": "1.16.0-rc.1",
   "description": "Driver for connection to Databricks SQL via Thrift API.",
   "main": "dist/index.js",
   "types": "dist/index.d.ts",