`insert_block` can be blocking for sometime if many blocks buffered

[mattsse]

Describe the feature

on insert_block, we can end up connecting all buffered blocks:

if we add to a side chain:

https://github.com/paradigmxyz/reth/blob/f25fcca33ec2fa90fac79771d8d94529bcbb38c2/crates/blockchain-tree/src/blockchain_tree.rs#L509-L510

this will execute all blocks and can take a while depending on how large side chain is.

since this is a blocking operation, this can cause lead to reth being unresponsive for a bit since CL messages are not handled.

I only observed this in debug mode where execution is considerably slower, so catching up 2 epochs takes quite some time.

the blocking operation try_connect_buffered will eventually finish, and continue operating as normal, and I think this is only an issue in debug mode.

however we should consider restricting how many blocks we connect in one go.

Additional context

No response