feat(payload): add support for stack of payload builders

[aroralanuk]

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Problem

We need a flexible way to combine and sequentially execute multiple payload builders of the same type, allowing for more complex and customizable payload building strategies. Fixes https://github.com/paradigmxyz/reth/issues/10438

Solution

Implement a new PayloadBuilderStack<L, R> that can hold and execute two builders of potentially different types in sequence, with the ability to nest these stacks for more complex arrangements.

Implementation Details

• Create PayloadBuilderStack<L, R> with two generic type parameters for left and right builders
• Allow for nested stacks, enabling complex arrangements like Stack<Stack<A, B>, C>

Testing

• None