feature request: metrics should have 'chain-id' where feasible

[PFC-developer]

in my configuration I have multiple horcrux services running (I deploy 1 horcrux service for each chain, not 1 horcrux service for ALL chains).

it would be nice to be able to specify a 'chain_id' or some custom label similar to how cosmos does.

for example:

global-labels = [
["chain_id","migaloo-1"],
]

it also looks like horcrux creates metrics with the hostname embedded into them.
for example

horcrux_andromeda_horcrux_0_runtime_alloc_bytes

shouldn't it just do
horcrux_runtime_alloc_bytes ?

[agouin]

Resolved by #198 #219