feat: add allow list to API keys (#19972)

Add API key allow list to the SDK

This PR adds an allow list to API keys in the SDK. The allow list is a list of targets that the API key is allowed to access. If the allow list is empty, a default allow list with a single entry that allows access to all resources is created.

The changes include:

- Adding a default allow list when generating an API key if none is provided
- Adding allow list to the API key response in the SDK
- Converting database allow list entries to SDK format in the API response
- Adding tests to verify the default allow list behavior



Fixes #19854

coderd/database/db2sdk/db2sdk.go

@@ -51,6 +51,13 @@ func ListLazy[F any, T any](convert func(F) T) func(list []F) []T {
 	}
 }
 
+func APIAllowListTarget(entry rbac.AllowListElement) codersdk.APIAllowListTarget {
+	return codersdk.APIAllowListTarget{
+		Type: codersdk.RBACResource(entry.Type),
+		ID:   entry.ID,
+	}
+}
+
 type ExternalAuthMeta struct {
 	Authenticated bool
 	ValidateError string