da: add grpc metrics

[tuxcanfly]

Overview

This PR adds gRPC metrics for the DA client. The methods are:

• da_blob_get for op-node
• da_blob_submit for op-batcher

the subsystem is da_client.

Sample metrics from devnet:

• op-node:

# HELP op_node_default_da_client_request_duration_seconds Histogram of DA client request durations
# TYPE op_node_default_da_client_request_duration_seconds histogram
op_node_default_da_client_request_duration_seconds_bucket{method="da_blob_get",le="0.005"} 13
op_node_default_da_client_request_duration_seconds_bucket{method="da_blob_get",le="0.01"} 13
op_node_default_da_client_request_duration_seconds_bucket{method="da_blob_get",le="0.025"} 13
op_node_default_da_client_request_duration_seconds_bucket{method="da_blob_get",le="0.05"} 13
op_node_default_da_client_request_duration_seconds_bucket{method="da_blob_get",le="0.1"} 13
op_node_default_da_client_request_duration_seconds_bucket{method="da_blob_get",le="0.25"} 13
op_node_default_da_client_request_duration_seconds_bucket{method="da_blob_get",le="0.5"} 13
op_node_default_da_client_request_duration_seconds_bucket{method="da_blob_get",le="1"} 13
op_node_default_da_client_request_duration_seconds_bucket{method="da_blob_get",le="2.5"} 13
op_node_default_da_client_request_duration_seconds_bucket{method="da_blob_get",le="5"} 13
op_node_default_da_client_request_duration_seconds_bucket{method="da_blob_get",le="10"} 13
op_node_default_da_client_request_duration_seconds_bucket{method="da_blob_get",le="+Inf"} 13
op_node_default_da_client_request_duration_seconds_sum{method="da_blob_get"} 0.035445792
op_node_default_da_client_request_duration_seconds_count{method="da_blob_get"} 13
# HELP op_node_default_da_client_requests_total Total DA requests initiated by the opnode's DA client
# TYPE op_node_default_da_client_requests_total counter
op_node_default_da_client_requests_total{method="da_blob_get"} 13

• op-batcher:

# TYPE op_batcher_default_da_client_request_duration_seconds histogram
op_batcher_default_da_client_request_duration_seconds_bucket{method="da_blob_submit",le="0.005"} 0
op_batcher_default_da_client_request_duration_seconds_bucket{method="da_blob_submit",le="0.01"} 0
op_batcher_default_da_client_request_duration_seconds_bucket{method="da_blob_submit",le="0.025"} 0
op_batcher_default_da_client_request_duration_seconds_bucket{method="da_blob_submit",le="0.05"} 0
op_batcher_default_da_client_request_duration_seconds_bucket{method="da_blob_submit",le="0.1"} 1
op_batcher_default_da_client_request_duration_seconds_bucket{method="da_blob_submit",le="0.25"} 2
op_batcher_default_da_client_request_duration_seconds_bucket{method="da_blob_submit",le="0.5"} 9
op_batcher_default_da_client_request_duration_seconds_bucket{method="da_blob_submit",le="1"} 24
op_batcher_default_da_client_request_duration_seconds_bucket{method="da_blob_submit",le="2.5"} 26
op_batcher_default_da_client_request_duration_seconds_bucket{method="da_blob_submit",le="5"} 26
op_batcher_default_da_client_request_duration_seconds_bucket{method="da_blob_submit",le="10"} 26
op_batcher_default_da_client_request_duration_seconds_bucket{method="da_blob_submit",le="+Inf"} 26
op_batcher_default_da_client_request_duration_seconds_sum{method="da_blob_submit"} 16.246764839000004
op_batcher_default_da_client_request_duration_seconds_count{method="da_blob_submit"} 26
# HELP op_batcher_default_da_client_requests_total Total DA requests initiated by the opnode's DA client
# TYPE op_batcher_default_da_client_requests_total counter
op_batcher_default_da_client_requests_total{method="da_blob_submit"} 26

Checklist

• New and updated code has appropriate documentation
• New and updated code has new and/or updated testing
• Required CI checks are passing
• Visual proof for any user facing features like CLI or documentation updates
• Linked issues closed with keywords