Do not de-allocate space used by accounts sparse trie

[shekhirin]

Describe the feature

Currently, every time we have a new block, we create an empty SparseTrie for the accounts trie to reveal new proofs and apply updates in there.

After #15637, still at least half of the time in reveal_account_proof is spent reserving the space for new nodes to insert

This can be optimized by not de-allocating the accounts trie

reth/crates/trie/sparse/src/state.rs

Lines 28 to 29 in ab85300

	/// Sparse account trie.
	state: SparseTrie<F::AccountNodeProvider>,

and instead just clear it and carry over to the next state root task invocation.

Additional context

No response