feat: make Pending transaction own the provider

[mattsse]

RootProvider is an arc, this should just be cloned into the pendingtransactionbuilder

alloy/crates/provider/src/provider/root.rs

Lines 23 to 26 in 4c32ff9

	pub struct RootProvider<T, N: Network = Ethereum> {
	/// The inner state of the root provider.
	pub(crate) inner: Arc<RootProviderInner<T, N>>,
	}

so we can send a this type across boundaries.