chore: add an issue bot

[Phoenix500526]

Please briefly answer these questions: add an issue bot so that contributors can assign the issue to themselves.

• what problem are you trying to solve? (or if there's no problem, what's the motivation for this change?)

• what changes does this pull request make?

• are there any non-obvious implications of these changes? (does it break compatibility with previous versions, etc)

[codecov[bot]]

Codecov Report

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

Project coverage is 75.23%. Comparing base (40763a8) to head (337744d). Report is 4 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #727 +/- ## ========================================== + Coverage 75.18% 75.23% +0.04% ========================================== Files 175 175 Lines 26793 26803 +10 Branches 26793 26803 +10 ========================================== + Hits 20144 20164 +20 + Misses 5437 5428 -9 + Partials 1212 1211 -1 ```

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