deps: add vendor depenency crate

Add cargo config to support building a unified cargo static lib to
include multiple crate dependencies to be used by Node.js.

This also allows additional crate dependencies to be added, like amaro.

Author: legendecas

deps/crates/.cargo/config.toml

@@ -0,0 +1,5 @@
+[source.crates-io]
+replace-with = "vendored-sources"
+
+[source.vendored-sources]
+directory = "vendor"

deps/crates/.gitignore

@@ -0,0 +1,3 @@
+# Include everything in `vendor/` except for hidden files
+!vendor/**/*
+.DS_Store