Use integer_array_t instead of array_t by eine · Pull Request #593 · VUnit/vunit

In this PR, examples 'array' and 'array_axis_vcs' are modified to use integer_array_t instead of array_t. Also, a deprecation warning is added, which is shown when add_array_util() is used.

This PR is expected to be merged in the next release, and the following removal branch should be merged in future releases: https://github.com/1138-4EB/vunit/compare/array_t...1138-4EB:rm-array_pkg?expand=1

Ref eine@9020d6e#r36134178