chore: add executor metrics

[ra0x3]

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Description

• PR adds a few metrics to the executor.
• Might have to add more later, but want to see how these do for now

Testing steps

• Start the service on beta-4 cargo run --bin fuel-indexer -- run --run-migrations --fuel-node-host beta-4.fuel.network --fuel-node-port 80
• Deploy the hello-world indexer forc index deploy --path examples/hello-world/hello-world
• View the new metrics curl http://localhost:29987/api/metrics
• Should see the new metrics

# EOF
# HELP executor_handler_operation_duration .
# TYPE executor_handler_operation_duration histogram
executor_handler_operation_duration_sum{path="fuellabs.hello_world"} 1071.0
executor_handler_operation_duration_count{path="fuellabs.hello_world"} 35
executor_handler_operation_duration_bucket{le="0.0",path="fuellabs.hello_world"} 0
executor_handler_operation_duration_bucket{le="10.0",path="fuellabs.hello_world"} 0
executor_handler_operation_duration_bucket{le="100.0",path="fuellabs.hello_world"} 35
executor_handler_operation_duration_bucket{le="1000.0",path="fuellabs.hello_world"} 35
executor_handler_operation_duration_bucket{le="10000.0",path="fuellabs.hello_world"} 35
executor_handler_operation_duration_bucket{le="50000.0",path="fuellabs.hello_world"} 35
executor_handler_operation_duration_bucket{le="100000.0",path="fuellabs.hello_world"} 35
executor_handler_operation_duration_bucket{le="500000.0",path="fuellabs.hello_world"} 35
executor_handler_operation_duration_bucket{le="1000000.0",path="fuellabs.hello_world"} 35
executor_handler_operation_duration_bucket{le="+Inf",path="fuellabs.hello_world"} 35
# EOF
# HELP executor_web_request_duration .
# TYPE executor_web_request_duration histogram
executor_web_request_duration_sum{path="fuellabs.hello_world"} 3164.0
executor_web_request_duration_count{path="fuellabs.hello_world"} 35
executor_web_request_duration_bucket{le="0.0",path="fuellabs.hello_world"} 0
executor_web_request_duration_bucket{le="10.0",path="fuellabs.hello_world"} 0
executor_web_request_duration_bucket{le="100.0",path="fuellabs.hello_world"} 28
executor_web_request_duration_bucket{le="1000.0",path="fuellabs.hello_world"} 35
executor_web_request_duration_bucket{le="10000.0",path="fuellabs.hello_world"} 35
executor_web_request_duration_bucket{le="50000.0",path="fuellabs.hello_world"} 35
executor_web_request_duration_bucket{le="100000.0",path="fuellabs.hello_world"} 35
executor_web_request_duration_bucket{le="500000.0",path="fuellabs.hello_world"} 35
executor_web_request_duration_bucket{le="1000000.0",path="fuellabs.hello_world"} 35
executor_web_request_duration_bucket{le="+Inf",path="fuellabs.hello_world"} 35
# EOF

Changelog

• chore: add executor metrics

[lostman]

I'll run the testing steps first thing tomorrow morning. Right now I only have a small change request.