chore: add scaffolding for git-metadata crate

Author: jdc-pub

.config/release-please-config.json

@@ -10,10 +10,9 @@
   "group-pull-request-title-pattern": "chore(release): bump crate versions on `${branch}`",
   "pull-request-footer": "This release was generated with [Release Please](https://github.com/googleapis/release-please).",
   "packages": {
-    "crates/git-rewrite": {
+    "crates/git-metadata": {
       "include-component-in-tag": false
-    },
-    "crates/git-filter-tree": {}
+    }
   },
   "plugins": [{ "type": "sentence-case" }, { "type": "cargo-workspace" }],
   "$schema": "https://raw.githubusercontent.com/googleapis/release-please/main/schemas/config.json"

.config/release-please-manifest.json

@@ -1,4 +1,3 @@
 {
-  "crates/git-rewrite": "0.1.2",
-  "crates/git-filter-tree": "0.3.0"
+  "crates/git-metadata": "0.0.0"
 }