Encode debug_traceTransaction without additional arguments

[MartinquaXD]

Description

#3982 introduced a small change that caused the settlement indexing to fail on lens.
The debug_traceTransaction calls are now failing with the error Alloy(ErrorResp(ErrorPayload { code: -32602, message: "Invalid params", data: Some(RawValue("missing field onlyTopCall at line 1 column 40")) })).
Previously we encoded a call with the arguments {"tracer": "callTracer"} (see here) but now due to how alloy's internal logic works we encode arguments like {"tracer": "callTracer", "tracerConfig": {}}. Alloy only skips encoding the tracer_config argument when it's null (see here) but GethDebugTracingOptions::call_tracer(CallConfig::default()) ends up putting an empty JSON object into tracer_config instead of null.

Changes

Update debug_traceTransaction arguments to not encode any tracerConfig.

How to test

Confirmed hypothesis with cast.
Current call:

cast rpc -r <LENS_RPC> debug_traceTransaction 0x4c1900589b428950ebd17008eecf5b6ca6e9698c5c02b450a8868fd94a30fb7c '{"tracer": "callTracer", "tracerConfig": {}}'
Error: server returned an error response: error code -32602: Invalid params, data: "missing field `onlyTopCall` at line 1 column 40"

Without additional tracerConfig:

cast rpc -r <LENS_RPC> debug_traceTransaction 0x4c1900589b428950ebd17008eecf5b6ca6e9698c5c02b450a8868fd94a30fb7c '{"tracer": "callTracer"}'
{"type":"call","from":"0x0000000000000000000000000000000000000000","to":"0x0000000000000000000000000000000000008001","gas":"0x3126b4","gasUsed":"0xf8d38"....