Quiescence related metrics

It would be useful to add new metrics to track the quiescence feature. These metrics could include:

- `quiesceNumTrans` the number of transactions that quiescence is tracking that need to be in a fully signed block
- `quiescePendBlocks` the number of blocks quiescence is tracking that are waiting to be fully signed
- ?

Start by locating the quiescence implementation and the project's existing metric definitions or tests. Review how transactions and blocks are tracked, then determine the complete metric set and verify that the resulting values accurately represent quiescence state.

Written by the indexing model from the issue text.