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Support listing metrics by prefix and depth

Heinz N. Gies requested to merge metric-variants into master

Created by: davecromberge

Propose a rename the function from metric_variants to metrics, as there is symmetry to the existing metrics/1 function.
From the dalmatiner-frontend perspective, it may allow a more concise resource location eg: http://localhost:8080/collections/7c/metrics/aW5mbHV4ZGIucHJvY2Vzc2Vz

The depth argument allows the client to configure the depth for the search by prefix.

Example: depth 1, prefix <<"base">>

{ok,[[<<"count">>],
     [<<"cpu">>],
     [<<"ctx-switch">>],
     ...
     [<<"swap">>],
     [<<"uptime">>],
     [<<"vmem">>]]}

Example: depth 3, prefix <<"base">>

{ok,[[<<"count">>],
     [<<"cpu">>],
     [<<"cpu">>,<<"0">>,<<"guest">>],
     [<<"cpu">>,<<"0">>,<<"guest_nice">>],
     [<<"cpu">>,<<"0">>,<<"idle">>],
     [<<"cpu">>,<<"0">>,<<"iowait">>],
    ...
     [<<"cpu">>,<<"1">>,<<"steal">>],
     [<<"cpu">>,<<"1">>,<<"system">>],
     [<<"cpu">>,<<"1">>,<<"user">>],
     [<<"cpu">>,<<"10">>,<<"idle">>]]}

Note that results above are decoded from dproto metric encoding.

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