Apply rate-limit on tracing endpoints

[m-Peter]

Closes: #703

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[m-Peter]

I have extracted the logic of TraceTransaction & TraceBlockByNumber to private functions, traceTransaction & traceBlockByNumber respectively, so that we can re-use their functionality in the DebugAPI, without actually applying any rate-limit. The rate-limit is applied to the public-facing functions.

[janezpodhostnik]

Nice.