Add SSDPResponse::sendto method and tests

[codecov[bot]]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.10 :tada:

Comparison is base (04d3ce2) 94.04% compared to head (c681504) 94.15%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #96 +/- ## ========================================== + Coverage 94.04% 94.15% +0.10% ========================================== Files 7 7 Lines 168 171 +3 ========================================== + Hits 158 161 +3 Misses 10 10 ``` | [Impacted Files](https://app.codecov.io/gh/codingjoe/ssdp/pull/96?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Johannes+Maron) | Coverage Δ | | |---|---|---| | [ssdp/messages.py](https://app.codecov.io/gh/codingjoe/ssdp/pull/96?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Johannes+Maron#diff-c3NkcC9tZXNzYWdlcy5weQ==) | `100.00% <100.00%> (ø)` | |

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