Add a simple nbytes representation in DataArrays and Dataset repr
#11312
| Job | Run time |
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| 3s | |
| 2s | |
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| 4m 48s | |
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| 4m 58s | |
| 4m 48s | |
| 4m 58s | |
| 4m 48s | |
| 4m 34s | |
| 4m 33s | |
| 1m 34s | |
| 4m 50s | |
| 4m 49s | |
| 4m 50s | |
| 59m 15s |