Proposed 2.0.1

[intelliot]

High Level Overview of Change

Highlights:

• Fixes unbounded memory growth when running the path_find command.
• Fixes a bug that, in some situations, results in online deletion causing delays in persisting records to disk.
• A new line in cfg/rippled-example.cfg sets send_queue_limit = 500. Consider adopting this setting in your own rippled.cfg in the appropriate stanza(s) for configured ws and wss port(s).
  • When the setting is not specified in the config, the default value is 100. At 100, during times when there are >200 transactions per ledger, rippled will disconnect WebSocket clients that subscribe to the transactions stream.
  • Clients receive a disconnected message with code 1008 or a Client too slow disconnection.
  • Using send_queue_limit = 500 fixes this issue.

The base branch is release. All releases (including betas) go in release. This PR will be merged with --ff-only (not squashed or rebased, and not using the GitHub UI).

Type of Change

• [x] Release

API Impact

No API impact.

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

:exclamation: No coverage uploaded for pull request base (master@2b0313d). Click here to learn what that means.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #4905 +/- ## ========================================= Coverage ? 61.49% ========================================= Files ? 797 Lines ? 70122 Branches ? 36238 ========================================= Hits ? 43119 Misses ? 19761 Partials ? 7242 ```

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