build: add package.json fields to standardize keys list

Author: Planeshifter

lib/node_modules/@stdlib/_tools/package-json/standardize/lib/keys.json

@@ -7,6 +7,7 @@
 	"author",
 	"maintainers",
 	"contributors",
+  "funding",
 	"bin",
 	"main",
 	"exports",
@@ -21,6 +22,7 @@
 	"repositories",
 	"bugs",
 	"dependencies",
+  "optionalDependencies",
 	"devDependencies",
 	"engines",
 	"os",