Rename delete_field -> pop_field

[hombit]

Fix #28

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[github-actions]

Before [24d32a0]	After [e942e0b]	Ratio	Benchmark (Parameter)
0	0	n/a	benchmarks.mem_list
1.06±0ms	1.06±0ms	1.00	benchmarks.time_computation

Click here to view all benchmarks.