Smoke test for exclusive_scan

[viralbhadeshiya]

Description

• Include basic smoke tests for exclusive_scan

See #6486

Checklist

• New or existing tests cover these changes.
• The documentation is up to date with these changes.

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[viralbhadeshiya]

@miscco this is the PR for exclusive_scan algorithm :)

[miscco]

Thanks a lot for adding this test, I would like to see a test with a custom binary operator. Maybe one that does lhs + rhs + 1 ?

[miscco]

We should replace this test by one that provides an init value and a suitable binary operator

[miscco]

This should just be

Suggested change

	for (std::size_t i = 0; i < N; ++i)
	{
	in[i] = static_cast<int>(i + 1);
	}
	std::iota(in.begin(), in.end(), 1);