feat!: v4 release (#871)

Any advanced configuration should be done via a
release-please-config.json.

Fixes #859
Fixes #858
Fixes #857
Fixes #852

feat!: remove most configuration options in favor of manifest
configuration to configure the release-please-action
refactor!: rewrite in typescript
feat!: remove command option in favor of setting `release-type` and
`skip-github-release`/`skip-github-pull-request`
feat!: run on node20
deps!: upgrade release-please to v16

.eslintrc.json

@@ -0,0 +1,12 @@
+{
+  "extends": "./node_modules/gts",
+  "root": true,
+  "overrides": [
+    {
+      "files": "test/*.ts",
+      "rules": {
+          "node/no-unpublished-import": 0
+      }
+    }
+  ]
+}