Add send with delay

[codecov[bot]]

Codecov Report

Patch coverage: 100.00% and project coverage change: +0.72% :tada:

Comparison is base (2e2b151) 80.25% compared to head (6e8ce65) 80.98%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #20 +/- ## ========================================== + Coverage 80.25% 80.98% +0.72% ========================================== Files 1 1 Lines 157 163 +6 ========================================== + Hits 126 132 +6 Misses 23 23 Partials 8 8 ``` | [Files Changed](https://app.codecov.io/gh/craigpastro/pgmq-go/pull/20?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Craig+Pastro) | Coverage Δ | | |---|---|---| | [pgmq.go](https://app.codecov.io/gh/craigpastro/pgmq-go/pull/20?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=Craig+Pastro#diff-cGdtcS5nbw==) | `80.98% <100.00%> (+0.72%)` | :arrow_up: |

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