Add getter for Client request timeout #4469

Job	Run time
check examples (ubuntu-latest / stable)	45s
check feature flags (ubuntu-latest / stable)	16m 27s
check docs (ubuntu-latest / stable)	1m 5s
check format (ubuntu-latest / nightly)	11s
check licenses (ubuntu-latest / stable)	23s
check linter (ubuntu-latest / stable)	1m 37s
check minimal versions of transitive dependencies (ubuntu-latest / stable)	38s
check minimal supported rust version (ubuntu-latest / msrv)	29s
check spelling (ubuntu-latest / nightly)	5m 46s
test (ubuntu-latest / stable)	7m 18s
test (macos-latest / stable)	8m 9s
test (windows-latest / stable)	11m 47s
	54m 35s

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