feat: tunnel TS exports, port forward labels, and db migrations

- Add TS derive and type annotations to all tunnel API param structs
- Export tunnel bindings to a tunnel/ subdirectory with index generation
- Change port forward label from String to Option<String>
- Add TunnelDatabase::init() with default subnet creation
- Add tunnel migration framework with m_00_port_forward_entry migration
  to convert legacy string-only port forwards to the new entry format

sdk/base/lib/osBindings/tunnel/NetworkInterfaceInfo.ts

@@ -0,0 +1,10 @@
+// This file was generated by [ts-rs](https://github.com/Aleph-Alpha/ts-rs). Do not edit this file manually.
+import type { GatewayType } from './GatewayType'
+import type { IpInfo } from './IpInfo'
+
+export type NetworkInterfaceInfo = {
+  name: string | null
+  secure: boolean | null
+  ipInfo: IpInfo | null
+  type: GatewayType | null
+}