Adds anonymous statistics reporting

[cyriltovena]

This is an example of the data being sent:

{
 "clusterID": "87996d6e-a28c-4d71-bf29-b8c1c80217d4",
 "createdAt": "2022-10-24T17:37:52.428098+02:00",
 "interval": "2022-10-24T21:17:07.428098+02:00",
 "intervalPeriod": 15,
 "target": "all",
 "version": {
  "version": "",
  "revision": "",
  "branch": "",
  "buildUser": "",
  "buildDate": "",
  "goVersion": "go1.19"
 },
 "os": "darwin",
 "arch": "amd64",
 "edition": "oss",
 "metrics": {
  "num_goroutine": 82,
  "distributor_profile_type_memory_received": {
   "total": 3,
   "rate": 0.0699954858592921
  },
  "distributor_replication_factor": 1,
  "ingester_active_tenants": 1,
  "num_cpu": 16,
  "distributor_bytes_received_total": {
   "total": 62303,
   "rate": 1252.6767081968958
  },
  "distributor_profile_type_block_received": {
   "total": 3,
   "rate": 0.07160711730364862
  },
  "distributor_profile_type_goroutine_received": {
   "total": 3,
   "rate": 0.07748612728011331
  },
  "distributor_profiles_received": {
   "total": 13,
   "rate": 0.2613805580541426
  },
  "memstats": {
   "num_gc": 9,
   "gc_cpu_fraction": 0.00021599721764962762,
   "alloc": 32432216,
   "total_alloc": 62217232,
   "sys": 56997128,
   "pause_total_ns": 2157750,
   "heap_alloc": 32432216,
   "heap_inuse": 36208640,
   "stack_inuse": 1835008
  },
  "distributor_bytes_received": {
   "max": 16437,
   "stddev": 5615.743195084342,
   "stdvar": 31536571.633136094,
   "avg": 4792.538461538461,
   "count": 13,
   "min": 104
  },
  "distributor_profile_type_mutex_received": {
   "total": 3,
   "rate": 0.07175572979102102
  },
  "distributor_profile_type_process_cpu_received": {
   "total": 1,
   "rate": 0.05736014690768328
  },
  "store_object_type": "filesystem"
 }
}

[simonswine]

LGTM

I have tested it a bit locally. The file seems to be written, so I think we should give this a spin in dev

[simonswine]

Apart from the reference config, it would be good to copy this (in a separate PR):

https://github.com/hi-rustin/mimir/blob/7f4e2c1604c80f9e8142e1c101e0710fd6d0124c/docs/sources/operators-guide/configure/about-anonymous-usage-statistics-reporting.md

[simonswine]

Test_Memberlist seems to have some flakes, will need to watch this