Add other resource types than disks

[inkel]

Currently this project only deals with unused disks, however, as pointed out by @Pokom in #70

…and if there are plans to extend unused to other resources such as loadbalancers, service accounts, SQL instances etc.

Initially this project was named unused-pds but then I realized it could be used for other than disks. Before releasing a v1.0 I think we should investigate which other resources could be included and extend both cmd/unused and cmd/unused-exporter to support those.

I suggest we keep this issue as a parent tracking issue to add all those resources we think it would be nice to manage with this.

[Pokom]

Not in any particular order:

• Compute Instances(Virtual machines)
• Load Balancers
• Service Accounts(and keys)
• SQL|Memcache|Redis instances
• Cloud Run|Lamba|Whatever azure's serverless is called

These all have some associated cost with them. Though I guess it does get a bit harder to tell when a compute instance is unused.