Test with vector as input

[Prasanna-Ponnusamy]

Describe your changes here:
Modified the existing t8_gtest_ghost_exchange file to take std::vector as input.

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[Davknapp]

I don't see how this tests the vector-conversion.
I propose to build a stdvector with standart data-types (int, double, ...), convert it to an sc_array and to compare its entries and other properties, such as length

[Davknapp]

Can you indent the files and take care for the failing tests please?

[Davknapp]

Thanks for the update! Please address my comments and also add your code to the CMake build system.