Fix Info Output Format

[vazois]

This PR ensures that the info output format follows the following pattern
<fieldname>: <subfield1>=<value1>, <subfield2>=<value2>, ....

[prvyk]

Can you also makes another change? In the section header names, just change the output so names not have spaces. Just happened to run into a tool which barfed on that.

/~https://github.com/predis/predis/blob/ac933cc5481eb4c7cc2132c1013ad3bbb780847a/src/Command/Redis/INFO.php#L59

e.g.

> diff --git a/libs/server/Metrics/Info/GarnetInfoMetrics.cs b/libs/server/Metrics/Info/GarnetInfoMetrics.cs
> index 94c05fdc..e264d62e 100644
> --- a/libs/server/Metrics/Info/GarnetInfoMetrics.cs
> +++ b/libs/server/Metrics/Info/GarnetInfoMetrics.cs
> @@ -305,17 +305,17 @@ namespace Garnet.server
>                  InfoMetricsType.CLUSTER => "Cluster",
>                  InfoMetricsType.REPLICATION => "Replication",
>                  InfoMetricsType.STATS => "Stats",
> -                InfoMetricsType.STORE => "Main Store",
> -                InfoMetricsType.OBJECTSTORE => "Object Store",
> -                InfoMetricsType.STOREHASHTABLE => "Main Store Hash Table Distribution",
> -                InfoMetricsType.OBJECTSTOREHASHTABLE => "Object Store Hash Table Distribution",
> -                InfoMetricsType.STOREREVIV => "Main Store Deleted Record Revivification",
> -                InfoMetricsType.OBJECTSTOREREVIV => "Object Store Deleted Record Revivification",
> +                InfoMetricsType.STORE => "Main_Store",
> +                InfoMetricsType.OBJECTSTORE => "Object_Store",
> +                InfoMetricsType.STOREHASHTABLE => "Main_Store_Hash_Table_Distribution",
> +                InfoMetricsType.OBJECTSTOREHASHTABLE => "Object_Store_Hash_Table_Distribution",
> +                InfoMetricsType.STOREREVIV => "Main_Store_Deleted_Record_Revivification",
> +                InfoMetricsType.OBJECTSTOREREVIV => "Object_Store_Deleted_Record_Revivification",
>                  InfoMetricsType.PERSISTENCE => "Persistence",
>                  InfoMetricsType.CLIENTS => "Clients",
>                  InfoMetricsType.KEYSPACE => "Keyspace",
>                  InfoMetricsType.MODULES => "Modules",
> -                InfoMetricsType.BPSTATS => "BufferPool Stats",
> +                InfoMetricsType.BPSTATS => "BufferPool_Stats",
>                  _ => "Default",
>              };
>          }
> 

(Camel case etc. would work too)