Add force_send method to channel Sender #2959

Job	Run time
dependencies	14s
test (1.61, ubuntu-latest)	1m 26s
test (1.61, windows-latest)	2m 2s
test (stable, ubuntu-latest)	18s
test (stable, windows-latest)	1m 9s
test (nightly, ubuntu-latest)	14s
careful	38s
test (nightly, windows-latest)	31s
clippy	15s
test (nightly, ubuntu-latest, i686-unknown-linux-gnu)	55s
codegen	28s
test (nightly, ubuntu-latest, armv7-unknown-linux-gnueabihf)	56s
features (msrv)	1m 34s
test (nightly, ubuntu-latest, armv5te-unknown-linux-gnueabi)	41s
miri	58s
features (nightly)	16s
rustfmt	8s
san	42s
docs	11s
loom	48s
shellcheck	24s
	14m 48s

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