Add `--resolve` flag for overriding DNS resolution #2040

Job	Run time
Rustfmt and clippy	31s
Test (x86_64-unknown-linux-gnu, ubuntu-latest, --features=native-tls)	1m 20s
Test (x86_64-unknown-linux-gnu, ubuntu-latest, --no-default-features --features=native-tls,online...	46s
Test (x86_64-apple-darwin, macos-latest, --features=native-tls)	1m 46s
Test (x86_64-pc-windows-msvc, windows-latest, --features=native-tls)	3m 54s
Test (x86_64-unknown-linux-musl, ubuntu-latest, true)	2m 2s
Test (aarch64-unknown-linux-musl, ubuntu-latest, true, -- --test-threads=4)	2m 5s
Test (arm-unknown-linux-gnueabihf, ubuntu-latest, true, -- --test-threads=4)	1m 50s
	14m 14s

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