Handle the key not found response in get task

[chrisli30]

A TODO to handle the key not found response in the sdk code. Getting 1004 after it’s deleted.

Another TODO is to create test cases to cover these delete and get scenarios.

node example get 1004
node:internal/process/promises:391
    triggerUncaughtException(err, true /* fromPromise */);
    ^

Error: 2 UNKNOWN: Key not found
    at callErrorFromStatus (/Users/mikasa/Code/EigenLayer-AVS/examples/node_modules/@grpc/grpc-js/build/src/call.js:31:19)
    at Object.onReceiveStatus (/Users/mikasa/Code/EigenLayer-AVS/examples/node_modules/@grpc/grpc-js/build/src/client.js:193:76)
    at Object.onReceiveStatus (/Users/mikasa/Code/EigenLayer-AVS/examples/node_modules/@grpc/grpc-js/build/src/client-interceptors.js:360:141)
    at Object.onReceiveStatus (/Users/mikasa/Code/EigenLayer-AVS/examples/node_modules/@grpc/grpc-js/build/src/client-interceptors.js:323:181)
    at /Users/mikasa/Code/EigenLayer-AVS/examples/node_modules/@grpc/grpc-js/build/src/resolving-call.js:129:78
    at process.processTicksAndRejections (node:internal/process/task_queues:77:11)
for call at
    at ServiceClientImpl.makeUnaryRequest (/Users/mikasa/Code/EigenLayer-AVS/examples/node_modules/@grpc/grpc-js/build/src/client.js:161:32)
    at ServiceClientImpl.<anonymous> (/Users/mikasa/Code/EigenLayer-AVS/examples/node_modules/@grpc/grpc-js/build/src/make-client.js:105:19)
    at /Users/mikasa/Code/EigenLayer-AVS/examples/example.js:66:32
    at new Promise (<anonymous>)
    at asyncRPC (/Users/mikasa/Code/EigenLayer-AVS/examples/example.js:65:10)
    at getTask (/Users/mikasa/Code/EigenLayer-AVS/examples/example.js:118:24)
    at /Users/mikasa/Code/EigenLayer-AVS/examples/example.js:264:13
    at process.processTicksAndRejections (node:internal/process/task_queues:95:5) {
  code: 2,
  details: 'Key not found',
  metadata: Metadata {
    internalRepr: Map(1) { 'content-type' => [ 'application/grpc' ] },
    options: {}
  }
}