feat(app): 🎋 add missing Sct component hooks

[cratelyn]

fixes #3739.

the App only ever invokes the Sct component's init_chain and begin_block hooks.

this isn't currently a bug, since its end_block and end_epoch hooks are noöps, but could easily lead to a surprising outcome in the future, if more logic was introduced to those trait methods.

checklist before requesting a review

• if this code contains consensus-breaking changes, i have added the "consensus-breaking" label. otherwise, i declare my belief that there are not consensus-breaking changes, for the following reason:

  while this does change the control flow of consensus-critical logic, this does not
  change the execution of incoming data. the hooks introduced here are noöps.

[cratelyn]

penumbra/crates/core/component/sct/src/component/sct.rs

Lines 59 to 69 in c5e30cf

	#[instrument(name = "sct_component", skip(_state, _end_block))]
	async fn end_block<S: StateWrite + 'static>(
	_state: &mut Arc<S>,
	_end_block: &abci::request::EndBlock,
	) {
	}
	#[instrument(name = "sct_component", skip(_state))]
	async fn end_epoch<S: StateWrite + 'static>(_state: &mut Arc<S>) -> anyhow::Result<()> {
	Ok(())
	}

for reference: