[Lang] Add ti.round op

[gaoxinge]

Related issue = #

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[strongoier]

Looks great! Thanks for your work! A little suggestion: could you also add the op in backends/vulkan/codegen_vulkan.cpp and backends/metal/data_types.cpp?

[gaoxinge]

@strongoier I have add round op code in backends/vulkan/codegen_vulkan.cpp (follow by link) and backends/metal/data_types.cpp, but I'm not sure whether it will work properly.

[strongoier]

Your modifications look pretty good to me. To verify your modifications, you can remove

taichi/tests/python/test_element_wise.py

Line 245 in 17a0a11

@ti.test(exclude=[ti.vulkan])

and see if CI can pass. However, our CI seems buggy on your PR (#3568), and you may need to wait for a fix for that. Sorry about that.

[strongoier]

Now our CI is fixed. You could try my comment above now.

[strongoier]

LGTM! Thanks!