feat: use tracing pool for tracing calls

[mattsse]

Closes #3904

integrates the new rayon tracing pool in rpc.

simplifies trace_ and debug_: get rid of on_blocking_task, instead EthTransaction trait spawns those calls.

calls that spawn now begin with spawn_ to make this clear.

This simplifies the interface

[codecov]

Codecov Report

Merging #3914 (2a50fba) into main (8cdb097) will decrease coverage by 1.35%.
The diff coverage is 21.22%.

Files Changed	Coverage Δ
crates/rpc/rpc-builder/src/auth.rs	44.16% <0.00%> (-0.23%)	⬇️
crates/rpc/rpc-builder/src/eth.rs	70.96% <ø> (ø)
crates/rpc/rpc/src/debug.rs	11.77% <0.00%> (+0.88%)	⬆️
crates/rpc/rpc/src/trace.rs	5.70% <0.00%> (-37.36%)	⬇️
crates/rpc/rpc/src/tracing_call.rs	69.44% <40.00%> (ø)
crates/rpc/rpc/src/eth/api/transactions.rs	21.68% <42.85%> (-6.00%)	⬇️
crates/rpc/rpc-builder/src/lib.rs	63.91% <76.92%> (-1.57%)	⬇️
crates/rpc/rpc/src/eth/api/mod.rs	61.30% <100.00%> (+0.28%)	⬆️
crates/rpc/rpc/src/eth/api/server.rs	93.85% <100.00%> (+0.01%)	⬆️
crates/rpc/rpc/src/eth/api/state.rs	50.39% <100.00%> (+0.79%)	⬆️

... and 59 files with indirect coverage changes

Flag	Coverage Δ
integration-tests	12.97% <18.39%> (-2.58%)	⬇️
unit-tests	64.52% <3.77%> (-0.01%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Components	Coverage Δ
reth binary	27.24% <ø> (ø)
blockchain tree	83.01% <ø> (ø)
pipeline	89.68% <ø> (ø)
storage (db)	73.22% <ø> (-0.98%)	⬇️
trie	94.70% <ø> (ø)
txpool	46.56% <ø> (ø)
networking	74.21% <ø> (-3.68%)	⬇️
rpc	56.75% <21.22%> (-1.84%)	⬇️
consensus	64.46% <ø> (ø)
revm	33.68% <ø> (ø)
payload builder	6.61% <ø> (ø)
primitives	86.96% <ø> (-1.12%)	⬇️

[Rjected]

LGTM, i like the docs on EthTransactions and naming that makes it clear what's spawned on the pool