Enable retry option for threaded dispatcher

[shikokuchuo]

Requires dev nanonext for now.

Addresses part of #163 and #168.

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Codecov Report

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

Project coverage is 99.71%. Comparing base (6db5360) to head (dabcb58).

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #169 +/- ## ======================================= Coverage 99.71% 99.71% ======================================= Files 9 9 Lines 692 698 +6 ======================================= + Hits 690 696 +6 Misses 2 2 ```

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[shikokuchuo]

With the significant architecture change in https://github.com/shikokuchuo/mirai/pull/170, it makes sense to re-visit once the new dispatcher type is established.