feat(ircrc-rosetta): add token-specific metrics

[fsodre]

This introduces a token-specific contextualized metrics class, used to emit metrics associated with a particular token when running multi-token rosetta.

Metrics now look like this, with token labels associated with the metrics:

# HELP ledger_sync_blocks_fetched_total Number of blocks fetched from the ledger
# TYPE ledger_sync_blocks_fetched_total counter
ledger_sync_blocks_fetched_total{token_display_name="ckBTC-mxzaz"} 47047
ledger_sync_blocks_fetched_total{token_display_name="ckETH-ss2fx"} 16
# HELP process_cpu_seconds_total Total user and system CPU time spent in seconds.
# TYPE process_cpu_seconds_total counter
process_cpu_seconds_total 10
# HELP process_max_fds Maximum number of open file descriptors.
# TYPE process_max_fds gauge
process_max_fds 1048576
# HELP process_open_fds Number of open file descriptors.
# TYPE process_open_fds gauge
process_open_fds 21
# HELP process_resident_memory_bytes Resident memory size in bytes.
# TYPE process_resident_memory_bytes gauge
process_resident_memory_bytes 46743552
# HELP process_start_time_seconds Start time of the process since unix epoch in seconds.
# TYPE process_start_time_seconds gauge
process_start_time_seconds 1744382003
# HELP process_threads Number of OS threads in the process.
# TYPE process_threads gauge
process_threads 18
# HELP process_virtual_memory_bytes Virtual memory size in bytes.
# TYPE process_virtual_memory_bytes gauge
process_virtual_memory_bytes 1213968384
# HELP rosetta_api_status_total Response status for ic-rosetta-api endpoints
# TYPE rosetta_api_status_total counter
rosetta_api_status_total{status_code="200",token_display_name="ckETH-ss2fx"} 1
# HELP rosetta_http_request_duration_seconds HTTP request latency in seconds
# TYPE rosetta_http_request_duration_seconds histogram
rosetta_http_request_duration_seconds_bucket{endpoint="/block",method="POST",status="200",token_display_name="ckETH-ss2fx",le="0.005"} 1
rosetta_http_request_duration_seconds_bucket{endpoint="/block",method="POST",status="200",token_display_name="ckETH-ss2fx",le="0.01"} 1
rosetta_http_request_duration_seconds_bucket{endpoint="/block",method="POST",status="200",token_display_name="ckETH-ss2fx",le="0.025"} 1
rosetta_http_request_duration_seconds_bucket{endpoint="/block",method="POST",status="200",token_display_name="ckETH-ss2fx",le="0.05"} 1
rosetta_http_request_duration_seconds_bucket{endpoint="/block",method="POST",status="200",token_display_name="ckETH-ss2fx",le="0.1"} 1
rosetta_http_request_duration_seconds_bucket{endpoint="/block",method="POST",status="200",token_display_name="ckETH-ss2fx",le="0.25"} 1
rosetta_http_request_duration_seconds_bucket{endpoint="/block",method="POST",status="200",token_display_name="ckETH-ss2fx",le="0.5"} 1
rosetta_http_request_duration_seconds_bucket{endpoint="/block",method="POST",status="200",token_display_name="ckETH-ss2fx",le="1"} 1
rosetta_http_request_duration_seconds_bucket{endpoint="/block",method="POST",status="200",token_display_name="ckETH-ss2fx",le="2.5"} 1
rosetta_http_request_duration_seconds_bucket{endpoint="/block",method="POST",status="200",token_display_name="ckETH-ss2fx",le="5"} 1
rosetta_http_request_duration_seconds_bucket{endpoint="/block",method="POST",status="200",token_display_name="ckETH-ss2fx",le="10"} 1
rosetta_http_request_duration_seconds_bucket{endpoint="/block",method="POST",status="200",token_display_name="ckETH-ss2fx",le="+Inf"} 1
rosetta_http_request_duration_seconds_sum{endpoint="/block",method="POST",status="200",token_display_name="ckETH-ss2fx"} 0.000276049
rosetta_http_request_duration_seconds_count{endpoint="/block",method="POST",status="200",token_display_name="ckETH-ss2fx"} 1
# HELP rosetta_verified_block_height Verified block height
# TYPE rosetta_verified_block_height gauge
rosetta_verified_block_height{token_display_name="ckETH-ss2fx"} 805409

[mbjorkqvist]

LGTM, thanks @fsodre!