Add support for JS tracer to muxTracer

[ArtificialPB]

Follow-up of #57, currently muxTracer supports only built-in tracers. It should also support JS tracers.

In the alloy-rs tracing crate, the MuxConfig and MuxFrame types will need to have map key changed to GethDebugTracerType. Changes in this project should be pretty much the same, with addition of supporting the JSInspector via DelegatingInspector. Changes in reth are probably not needed.

The JSInspector is under js-tracer feature, so a feature gate for it in MuxInspector will need to be added as well.

[mattsse]

@ArtificialPB I'll need to bump evm-inspectors on reth shortly, so if you find the time I'd appreciate a pr that adds the missing ::Mux handler for debug_trace* etc:

https://github.com/paradigmxyz/reth/blob/e21304947b6a46ba524d4b1e68351b05587d8892/crates/rpc/rpc/src/debug.rs#L279-L279

https://github.com/paradigmxyz/reth/blob/e21304947b6a46ba524d4b1e68351b05587d8892/crates/rpc/rpc/src/debug.rs#L512-L512

[ArtificialPB]

@mattsse yeah, just opened it about an hour ago: paradigmxyz/reth#7053

[mattsse]

ah amazing!
ty