feat: remove KeyringSnapControllerClient to fix dependency problems

package.json

@@ -39,9 +39,7 @@
   },
   "dependencies": {
     "@metamask/providers": "^14.0.1",
-    "@metamask/snaps-controllers": "^4.0.0",
     "@metamask/snaps-sdk": "^1.3.2",
-    "@metamask/snaps-utils": "^5.1.2",
     "@metamask/utils": "^8.1.0",
     "@types/uuid": "^9.0.1",
     "superstruct": "^1.0.3",

src/index.ts

@@ -3,7 +3,6 @@ export * from './eth';
 export * from './events';
 export * from './internal';
 export * from './KeyringClient';
-export * from './KeyringSnapControllerClient';
 export * from './KeyringSnapRpcClient';
 export * from './rpc-handler';
 export * from './snap-utils';