Add progress bar for sysroot download #451

Job	Run time
Check	34s
Clippy	46s
Rustfmt	7s
MSRV	39s
spellcheck	12s
Test Suite (ubuntu-latest, stable, clang-cl)	3m 24s
Test Suite (ubuntu-latest, stable, clang)	2m 57s
Test Suite (ubuntu-latest, nightly, clang-cl)	2m 52s
Test Suite (ubuntu-latest, nightly, clang)	2m 39s
Test Suite (macos-latest, stable, clang-cl)	2m 59s
Test Suite (macos-latest, stable, clang)	2m 22s
Test Suite (macos-latest, nightly, clang-cl)	3m 26s
Test Suite (macos-latest, nightly, clang)	2m 27s
Test Suite (windows-latest, stable, clang-cl)	2m 55s
Test Suite (windows-latest, stable, clang)	3m 1s
Test Suite (windows-latest, nightly, clang-cl)	3m 10s
Test Suite (windows-latest, nightly, clang)	3m 15s
	37m 45s

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