Feature: Add option to exclude per consumer stream metrics

[nantiferov]

Describe the problem
Hi,

I noticed that with enabling existing check-streams / check-single-streams options exporter fetches quite a lot of metrics per each consumer. As a result, it creates additional load on TSDB and I'm not sure these metrics will be useful.

However, I find group/stream level metrics quite useful. What do you think about adding one more option to skip adding consumer level metrics for streams (default disabled to keep current behaviour)?

I can prepare PR with implementation.

What version of redis_exporter are you running?
Please run redis_exporter --version if you're not sure what version you're running.

• 0.3x.x
• 1.x.x

Running the exporter
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Please include details about env variables, command line parameters, your orchestration setup, etc.

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Additional context
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[oliver006]

I think that's a great idea!
Happy to review a PR. Thanks!