feat: add service capabilities definition (#79)

The latest libp2p release allows services to declare their
capabilities (what they provide to the node) and their dependencies
(the capabilities they require other services to provide for the
config to be "valid").

Adds the `serviceCapabilities` symbol property that says Yamux
provides the `@libp2p/stream-multiplexing` capability.

package.json

@@ -172,7 +172,7 @@
     "docs": "aegir docs"
   },
   "dependencies": {
-    "@libp2p/interface": "^1.1.3",
+    "@libp2p/interface": "^1.5.0",
     "@libp2p/utils": "^5.2.5",
     "get-iterator": "^2.0.1",
     "it-foreach": "^2.0.6",

src/muxer.ts

@@ -1,4 +1,4 @@
-import { CodeError, setMaxListeners } from '@libp2p/interface'
+import { CodeError, serviceCapabilities, setMaxListeners } from '@libp2p/interface'
 import { getIterator } from 'get-iterator'
 import { pushable, type Pushable } from 'it-pushable'
 import { Uint8ArrayList } from 'uint8arraylist'
@@ -28,6 +28,12 @@ export class Yamux implements StreamMuxerFactory {
     this._init = init
   }
 
+  readonly [Symbol.toStringTag] = '@chainsafe/libp2p-yamux'
+
+  readonly [serviceCapabilities]: string[] = [
+    '@libp2p/stream-multiplexing'
+  ]
+
   createStreamMuxer (init?: YamuxMuxerInit): YamuxMuxer {
     return new YamuxMuxer(this._components, {
       ...this._init,