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title: add prometheus label "is_rate_limited" to rpc calls

doc:
  - audience: Node Operator
    description: |
      This PR adds a label "is_rate_limited" to the prometheus metrics "substrate_rpc_calls_time" and "substrate_rpc_calls_finished"
      than can be used to distinguish rate-limited RPC calls from other RPC calls. Because rate-limited RPC calls may take
      tens of seconds.

crates: [ ]