ui: add blocking information for active queries/txns in WAITING state #79131
Description
On the active transaction details page, update UI to show:
- blocked database, table, schema, index and row
- time spent waiting
- add table for transactions waiting for currently_viewed_txn shown txn
- add table for transactions that currently_viewed_txn is waiting for
On the active stmt details page, update UI to show:
- blocked table and row
- add table for statements that currently_viewed_stmt is waiting for
Jira issue: CRDB-14590