feat: support adding traceID and spanID

[codecov-commenter]

Codecov Report

Attention: 12 lines in your changes are missing coverage. Please review.

Comparison is base (26cd833) 0.00% compared to head (76965f7) 0.00%.

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Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #7 +/- ## ===================================== Coverage 0.00% 0.00% ===================================== Files 3 3 Lines 327 339 +12 ===================================== - Misses 327 339 +12 ``` | [Flag](https://app.codecov.io/gh/samber/slog-gin/pull/7/flags?src=pr&el=flags&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Samuel+Berthe) | Coverage Δ | | |---|---|---| | [unittests](https://app.codecov.io/gh/samber/slog-gin/pull/7/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Samuel+Berthe) | `0.00% <0.00%> (ø)` | | 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=Samuel+Berthe#carryforward-flags-in-the-pull-request-comment) to find out more. | [Files](https://app.codecov.io/gh/samber/slog-gin/pull/7?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Samuel+Berthe) | Coverage Δ | | |---|---|---| | [middleware.go](https://app.codecov.io/gh/samber/slog-gin/pull/7?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Samuel+Berthe#diff-bWlkZGxld2FyZS5nbw==) | `0.00% <0.00%> (ø)` | |

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