feat: Add AutoNAT behavior #1950

Job	Run time
changes	7s
run-deny	1m 57s
run-tests-windows (stable, all)	18m 40s
run-checks (ubuntu-latest, stable)	3m 45s
run-tests-windows (stable, none)	12m 15s
run-checks (ubuntu-latest, nightly)	3m 12s
run-tests-windows (nightly, all)	10m 58s
run-checks (ubuntu-latest, 1.75.0)	2m 25s
run-cargo-tests	7m 16s
run-tests-windows (nightly, none)	8m 47s
run-checks (macos-14, stable)	20m 34s
run-checks (macos-14, nightly)	3m 0s
run-docs	5m 10s
run-checks (macos-14, 1.75.0)	3m 14s
run-tests (ubuntu-latest, stable, all)	9m 46s
run-checks (windows-latest, stable)	8m 39s
run-tests (ubuntu-latest, stable, none)	6m 15s
run-checks (windows-latest, nightly)	8m 4s
build-and-run-examples	0s
run-tests (ubuntu-latest, nightly, all)	9m 35s
run-checks (windows-latest, 1.75.0)	4m 44s
run-tests (ubuntu-latest, nightly, none)	6m 31s
run-tests (macos-13, stable, all)	10m 58s
run-tests (macos-13, stable, none)	8m 0s
run-tests (macos-13, nightly, all)	12m 21s
run-tests (macos-13, nightly, none)	8m 6s
	3h 14m 19s

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