Add field/2 for extracting field from struct (#839) #382

Job	Run time
NIF 2.15 - aarch64-apple-darwin (macos-11 \| default)	32m 20s
NIF 2.15 - aarch64-unknown-linux-gnu (ubuntu-20.04 \| default)	9m 2s
NIF 2.15 - aarch64-unknown-linux-musl (ubuntu-20.04 \| default)	9m 10s
NIF 2.15 - x86_64-apple-darwin (macos-11 \| default)	33m 1s
NIF 2.15 - x86_64-pc-windows-gnu (windows-2022 \| default)	19m 40s
NIF 2.15 - x86_64-pc-windows-gnu (windows-2022 \| legacy_cpu)	19m 10s
NIF 2.15 - x86_64-pc-windows-msvc (windows-2019 \| default)	19m 43s
NIF 2.15 - x86_64-pc-windows-msvc (windows-2019 \| legacy_cpu)	18m 39s
NIF 2.15 - x86_64-unknown-freebsd (ubuntu-22.04 \| default)	8m 50s
NIF 2.15 - x86_64-unknown-freebsd (ubuntu-22.04 \| legacy_cpu)	8m 43s
NIF 2.15 - x86_64-unknown-linux-gnu (ubuntu-20.04 \| default)	8m 19s
NIF 2.15 - x86_64-unknown-linux-gnu (ubuntu-20.04 \| legacy_cpu)	8m 5s
NIF 2.15 - x86_64-unknown-linux-musl (ubuntu-20.04 \| default)	8m 52s
	3h 23m 34s

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