Support gRPC connection options for retry and timeout #1446

Job	Run time
service-tests (buildbarn)	1m 33s
service-tests (buildgrid)	3m 26s
build_docs	3m 35s
Build Python wheel packages on ubuntu-22.04	4m 28s
tests (debian-11)	37m 29s
tests (fedora-40)	25m 29s
tests (fedora-41)	24m 1s
tests (fedora-missing-deps)	14m 46s
tests (ubuntu-22.04)	30m 32s
tests (lint)	1m 36s
tests (mypy)	38s
tests (plugins-master, true)	24m 55s
Test Python packages: wheels-manylinux_2_28-cp39	1m 8s
Test Python packages: wheels-manylinux_2_28-cp310	56s
Test Python packages: wheels-manylinux_2_28-cp311	1m 2s
Test Python packages: wheels-manylinux_2_28-cp312	56s
Test Python packages: wheels-manylinux_2_28-cp313	55s
	2h 57m 25s

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