ethclient/gethclient: add tracing API methods

[DeVikingMark]

Added methods:

• TraceTransaction - trace transaction execution
• TraceCall - trace contract call
• TraceBlock - trace all transactions in a block
• TraceChain - trace transactions across a range of blocks
• TraceCallWithCallTracer - specialized method with call tracer
• TraceTransactionWithCallTracer - specialized method with call tracer

Fixes #28182

[s1na]

As I've mentioned before I think just a super-light wrapper around the tracing methods that returns interface{} doesn't make as much sense. I think I will have to work on the generic methods myself.

In the meanwhile we can accept the CallTracer specific methods. I think those are valuable. Please remove everything else and only keep CallTracer methods.

[s1na]

I vaguely remembered there was another PR. And indeed: there is also #31364 which does exactly that. I will take a closer at both and if equal in quality will merge the "earlier" PR.

[DeVikingMark]

@s1na I've updated the PR to keep only the CallTracer-specific methods as requested. I've removed all generic tracing methods that return interface{} (TraceTransaction, TraceCall, TraceBlock, and TraceChain) and kept only the CallTracer-specific methods (TraceCallWithCallTracer and TraceTransactionWithCallTracer). I've also fixed the remaining implementation to ensure proper type safety.

[paulmillr]

what about trace_filter?