feat: add a generated OID db to const-oid

const-oid/Cargo.toml

@@ -21,6 +21,7 @@ hex-literal = "0.3"
 
 [features]
 std = []
+db = []
 
 [package.metadata.docs.rs]
 all-features = true

const-oid/oiddbgen/Cargo.toml

@@ -0,0 +1,14 @@
+[package]
+name = "oiddbgen"
+version = "0.1.0"
+edition = "2021"
+
+[dependencies]
+convert_case = "0.5.0"
+proc-macro2 = "1.0.36"
+quote = "1.0.15"
+regex = "1.5.4"
+syn = "1.0.86"
+
+[workspace]
+members = ["."]

const-oid/oiddbgen/README.md

@@ -0,0 +1,11 @@
+# Welcome to oiddbgen!
+
+This program is internal-only and is used to generate the OID database tree.
+
+# How to Run
+
+If you want to generate the database yourself, from the `const-oid` directory you can just run:
+
+```
+$ cargo run --manifest-path=oiddbgen/Cargo.toml | rustfmt > src/db/gen.rs
+```