Add execution traces to ExEx

[pistomat]

Describe the feature

I want to consume execution traces in my ExEx.

Currently the Chain struct does not contain them. The obvious solution would be to re-execute the block with a custom executor, but that would mean unnecessary additional computation.

I hear there is a plan to add a custom executor with an inspector. As per reth telegram group discussion, I am adding this issue.

CC @mattsse @shekhirin

Additional context

No response