[TrafficControl] Add sampling

[williampsmith]

Description

• For error tallies, sample by error_weight, as defined by the originating server based on the error type.
• For spam tallies, sample based on sampling weight, a new config parameter (by default, we will only tally 20% of "all traffic" for spam policy)

Test plan

How did you test the new or updated feature?

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Release notes

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• [ ] Protocol:
• [ ] Nodes (Validators and Full nodes):
• [ ] Indexer:
• [ ] JSON-RPC:
• [ ] GraphQL:
• [ ] CLI:
• [ ] Rust SDK:

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