feat(c/driver/postgresql): add arrow.opaque type metadata
#3395
| Job | Run time |
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| 6m 29s | |
| 2m 26s | |
| 1m 32s | |
| 3m 59s | |
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| 5m 6s | |
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| 58s | |
| 3m 1s | |
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| 7m 9s | |
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| 7m 20s | |
| 3m 38s | |
| 9m 43s | |
| 2m 51s | |
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| 3m 51s | |
| 4m 24s | |
| 2m 48s | |
| 2m 36s | |
| 2h 7m 17s |