Add `join_asof/3` (#1122) #481

Job	Run time
NIF 2.15 - aarch64-apple-darwin (macos-13 \| default)	36m 1s
NIF 2.15 - x86_64-pc-windows-gnu (windows-2025 \| default)	31m 5s
NIF 2.15 - aarch64-unknown-linux-musl (ubuntu-22.04 \| default)	18m 50s
NIF 2.15 - x86_64-pc-windows-gnu (windows-2025 \| legacy_cpu)	31m 6s
NIF 2.15 - aarch64-unknown-linux-gnu (ubuntu-22.04 \| default)	20m 19s
NIF 2.15 - x86_64-pc-windows-msvc (windows-2025 \| default)	29m 49s
NIF 2.15 - x86_64-unknown-freebsd (ubuntu-22.04 \| legacy_cpu)	17m 23s
NIF 2.15 - x86_64-unknown-linux-gnu (ubuntu-22.04 \| default)	16m 18s
NIF 2.15 - x86_64-unknown-freebsd (ubuntu-22.04 \| default)	17m 14s
NIF 2.15 - x86_64-pc-windows-msvc (windows-2025 \| legacy_cpu)	30m 13s
NIF 2.15 - x86_64-apple-darwin (macos-13 \| default)	38m 56s
NIF 2.15 - x86_64-unknown-linux-musl (ubuntu-22.04 \| default)	17m 6s
NIF 2.15 - x86_64-unknown-linux-gnu (ubuntu-22.04 \| legacy_cpu)	16m 17s
	5h 20m 37s

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