Add DNS reply code enum to inet:dns:request:reply:code (SYN-7841)

[codecov[bot]]

Codecov Report

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

Project coverage is 96.30%. Comparing base (e538c92) to head (94d747f). Report is 1 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #3868 +/- ## ========================================== - Coverage 96.37% 96.30% -0.08% ========================================== Files 244 244 Lines 54469 54470 +1 ========================================== - Hits 52496 52456 -40 - Misses 1973 2014 +41 ``` | [Flag](https://app.codecov.io/gh/vertexproject/synapse/pull/3868/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=vertexproject) | Coverage Δ | | |---|---|---| | [linux](https://app.codecov.io/gh/vertexproject/synapse/pull/3868/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=vertexproject) | `96.30% <100.00%> (+<0.01%)` | :arrow_up: | | [linux_replay](https://app.codecov.io/gh/vertexproject/synapse/pull/3868/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=vertexproject) | `?` | | Flags with carried forward coverage won't be shown. [Click here](https://docs.codecov.io/docs/carryforward-flags?utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=vertexproject#carryforward-flags-in-the-pull-request-comment) to find out more.

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