[DPE-2645] POC Add shards to cluster

[MiaAltieri]

Issue

Shards are not currently added to cluster

Solution

Add shards to cluster.

Limitations

This does limit the number of shards added to a cluster at a given time. This should be done by checking the Primary shard, and basing the number of shards added on the number of secondaries in the Primary shard. There is no MongoDB Command to retrieve the primary shard, but there is a mongosh one. This can be implemented, but might be tricky. This should be saved for a future epic.

Testing

As a POC there are not tests included in this PR. Testing was performed by hand by hand:

[direct: mongos] admin> sh.status()
shardingVersion
{ _id: 1, clusterId: ObjectId("65152d236139b01f40f20c7d") }
---
shards
[
  {
    _id: 'shard-one',
    host: 'shard-one/10.61.64.125:27017',
    state: 1,
    topologyTime: Timestamp({ t: 1695886769, i: 4 })
  }
]
---
active mongoses
[ { '6.0.6-5': 1 } ]
---
autosplit
{ 'Currently enabled': 'yes' }
---
balancer
{
  'Currently running': 'no',
  'Currently enabled': 'yes',
  'Failed balancer rounds in last 5 attempts': 0,
  'Migration Results for the last 24 hours': 'No recent migrations'
}
---
databases
[
  {
    database: { _id: 'config', primary: 'config', partitioned: true },
    collections: {
      'config.system.sessions': {
        shardKey: { _id: 1 },
        unique: false,
        balancing: true,
        chunkMetadata: [ { shard: 'shard-one', nChunks: 1024 } ],
        chunks: [
          'too many chunks to print, use verbose if you want to force print'
        ],
        tags: []
      }
    }
  }
]

[direct: mongos] admin> use test_db
[direct: mongos] admin> db.createCollection("cool_animals")
[direct: mongos] admin> db.cool_animals.insertOne({"horses":"unicorn"})
[direct: mongos] admin> sh.enableSharding("test_db")
{
  ok: 1,
  '$clusterTime': {
    clusterTime: Timestamp({ t: 1695887676, i: 1 }),
    signature: {
      hash: Binary.createFromBase64("/dNkOmzElTKr0AiBFTYgUWrxu24=", 0),
      keyId: Long("7283777600688750617")
    }
  },
  operationTime: Timestamp({ t: 1695887676, i: 1 })
}


# then on shard
shard-one [primary] admin> show dbs
admin    208.00 KiB
config   620.00 KiB
local    564.00 KiB
test_db   40.00 KiB