Adding AccessTokenMiddleware to support oauth

[toanvc]

Why?

A few months back I created an issue #239, that we need to use Oauth with bearer authentication in our project. I haven't heard any responses yet from the issue I created. So we went ahead and implemented ourself.

What

In this MR, I added renew middleware from mappersmith project https://github.com/tulios/mappersmith#-renew. This will help to renew the token if it's expired. I also added a way that we can set the refreshThresholdMs to auto refresh the token if it's expired by our timer.

Example

// We have a refreshToken function to get the token from our service
export async function refreshToken(authHost: string, clientId: string, clientSecret: string): Promise<string> {
  /// creating your data and axiosConfig
  const response = await axios.post<PostObject>(authHost, data, axiosConfig)
  return `Bearer ${response.data.access_token}`
}

// And add it into the params:
new SchemaRegistry({
      host: host,
      accessTokenParams: {
        clientCredentials: {
          clientId: '',
          clientSecret: ''
        },
        authHost: '',
        refreshToken: refreshToken
      }
    })