replace reth crate dep from examples with reth-ethereum

[mattsse]

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Describe the feature

we've now move the reth Clie type to reth-ethereum, we can now simplify these imports in examples

https://github.com/paradigmxyz/reth/blob/8ae89bd366798e5936271a536c944e7f6bfd6b9a/examples/node-custom-rpc/src/main.rs#L23-L24

and import Cli (and others) directly from reth-ethereum

TODO

• remove reth.workspace from examples where possible
• import cli type directly from reth-ethereum: https://github.com/paradigmxyz/reth/blob/8ae89bd366798e5936271a536c944e7f6bfd6b9a/crates/ethereum/reth/src/lib.rs#L22-L24

Additional context

No response