Klaus Post 1080609c86
Reuse buffers when writing metadata (#13040)
Simplify returning buffers.

Tested using `warp mixed --duration=1m --obj.size=100K`:

```
Operation: DELETE
Operations: 7148 -> 7642
* Average: +6.77% (+8.1) obj/s
-------------------
Operation: GET
Operations: 32200 -> 34403
* Average: +6.74% (+3.5 MiB/s) throughput, +6.74% (+36.2) obj/s
* First Byte: Average: -105.403µs (-3%), Median: -309µs (-11%), Best: -2.7µs (-0%), Worst: +3.5637ms (+3%)
-------------------
Operation: PUT
Operations: 10741 -> 11475
* Average: +6.78% (+1.2 MiB/s) throughput, +6.78% (+12.1) obj/s
-------------------
Operation: STAT
Operations: 21465 -> 22927
* Average: +6.71% (+24.0) obj/s
```
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