feat: configurable client reqq (#7030)

* chore: housekeeping

* refactor: raise client reqq value

* feat: allow configuring client reqq value

* feat: expose reqq config in RPC

* test: add new key

* code review: distinguish client vs peer

* docs: fix new config name

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Co-authored-by: Charles Kerr <charles@charleskerr.com>

docs/rpc-spec.md

@@ -554,6 +554,7 @@ Response arguments: `path`, `name`, and `id`, holding the torrent ID integer
 | `queue-stalled-enabled` | boolean | whether or not to consider idle torrents as stalled
 | `queue-stalled-minutes` | number | torrents that are idle for N minuets aren't counted toward seed-queue-size or download-queue-size
 | `rename-partial-files` | boolean | true means append `.part` to incomplete files
+| `reqq` | number | the number of outstanding block requests a peer is allowed to queue in the client
 | `rpc-version-minimum` | number | the minimum RPC API version supported
 | `rpc-version-semver` | string | the current RPC API version in a [semver](https://semver.org)-compatible string
 | `rpc-version` | number | the current RPC API version