feat(c-binding): accept explicit span timestamps #345

Job	Run time
build-system-tests-artifact	7s
verify	1m 0s
system-tests / Get parameters / Get parameters	17s
system-tests / parametric / parametric (4)	2m 31s
system-tests / parametric / parametric (3)	2m 40s
system-tests / parametric / parametric (6)	3m 23s
system-tests / parametric / parametric (1)	4m 16s
system-tests / parametric / parametric (2)	4m 16s
system-tests / parametric / parametric (8)	2m 29s
system-tests / parametric / parametric (5)	2m 4s
system-tests / parametric / parametric (7)	2m 33s
system-tests / Build end-to-end (${{ matrix.weblog.name }})	0s
system-tests / End-to-end #${{ matrix.job.weblog_instance }}	0s
build-windows-bazel (.bazelrc.std)	3m 0s
build-windows-cmake (arm64)	4m 52s
build-windows-cmake (amd64)	6m 27s
build-linux-cmake (llvm, arm64)	2m 32s
build-windows-bazel (.bazelrc.absl)	2m 37s
build-linux-cmake (llvm, x64)	2m 39s
build-linux-cmake (gnu, arm64)	2m 57s
build-linux-cmake (gnu, x64)	3m 7s
build-linux-bazel (gnu, x64, .bazelrc.absl)	1m 5s
build-linux-bazel (llvm, arm64, .bazelrc.std)	1m 6s
build-linux-bazel (llvm, arm64, .bazelrc.absl)	1m 6s
build-linux-bazel (gnu, arm64, .bazelrc.absl)	1m 15s
build-linux-bazel (gnu, x64, .bazelrc.std)	1m 6s
build-linux-bazel (llvm, x64, .bazelrc.std)	1m 16s
build-linux-bazel (gnu, arm64, .bazelrc.std)	1m 22s
build-linux-bazel (llvm, x64, .bazelrc.absl)	1m 14s
coverage	2m 22s
system-tests / Report failures	0s
	1h 5m 39s

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