Docs for https://github.com/pgdogdev/pgdog/pull/1502 - #111
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Adds an admin `FORCE_RELOAD` command, which acts as a normal `RELOAD` plus guarantees all in-flight transactions are terminated prior to the command's conclusion (and subsequent transactions are sent to the new `Pool`s). Uses `CancellationToken` to handle cancellation requests (from `FORCE_RELOAD`) to terminate connections. In addition to the termination logic that evicts `Clients`, it also cancels queries that are running on Postgres using `Server::cancel`. Uses a child token to prevent multiple `Clients` having contention on the `Cluster`'s `CancellationToken` when cloning. This was changed when benchmarking from a clone (reducing overhead by 80%). When evicted, Clients receive the standard Postgres admin termination error. These cases are all tested in the integration test `rust/admin_reload.rs`, where it tests (1) termination in an idle transaction, (2) termination in an ongoing query (pg_sleep), (3) checking that the ongoing query is no longer running on Postgres. PR for documentation of this command: pgdogdev/docs#111 Fixes #1472.
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