Add Purescript Tests

[rzuckerm]

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Please fill one of the sections below as applicable.
Please also add any other relevant information to the Notes section at the bottom.
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I Am Adding New Tests for a Language

• I fixed Add Purescript Testing #3553
• I named the pull request using Add {LANGUAGE} Tests format
• I added a testinfo.yml files (see contributing documentation)
  • I used an officially supported docker image or one that I personally trust
• I verified all tests are passing

Other Notes

I had to change the "Hello World" sample to get it to pass. Also, the build system is rather complex.

[jrg94]

I quite like this import syntax.