Feature Request: Make deployment labels for Prometheus metrics consistent (ie. all base58 or all bytes32)

[Pete-LunaNova]

Currently the graph-node exports Prometheus metrics with deployments labelled in the base58 format, yet the indexer-service uses bytes32 format.

It would be preferable for all parts of the infrastructure to use the same format. Base58 may make more sense as indexers use this form to interact with the graph-cli.