separate redis on kibana dependencies

[sibelius]

Is your feature request related to a problem? Please describe.

We have many redis instances, but it only shows one redis at the dependency, can we have redis/hostname like mongodb ?

Describe the solution you'd like
A clear and concise description of what you want to happen.

improve instrumentation to separate redis per hostname

Describe alternatives you've considered
A clear and concise description of any alternative solutions or features you've considered.

patch-package this package

Additional context
Add any other context or screenshots about the feature request here.

screenshot here

[sibelius]

this is the mongodb

"span": {
      "duration": {
        "us": 11000
      },
      "representative_count": 1,
      "subtype": "mongodb",
      "destination": {
        "service": {
          "resource": "mongodb/mydatabase"
        }
      },

the redis one is like this

"span": {
      "duration": {
        "us": 2282
      },
      "representative_count": 1,
      "subtype": "redis",
      "destination": {
        "service": {
          "resource": "redis"
        }
      },

[sibelius]

const dbContext = { type: 'redis', instance: options.host };
      span.setDbContext(dbContext);

is this enough to give more information about redis instance?

https://github.com/elastic/apm-agent-nodejs/blob/main/lib/instrumentation/modules/ioredis.js#L73