refactor: Add terraform example of project with resource

[bryphe-coder]

This just adds the most minimal terraform script to provision a resource (the null_resource) that doesn't require a cloud provider.

With this, we can test creating projects that have an associated resource:

[codecov]

Codecov Report

Merging #346 (3d3a0fd) into main (1789ba0) will decrease coverage by 0.02%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##             main     #346      +/-   ##
==========================================
- Coverage   67.62%   67.60%   -0.03%     
==========================================
  Files         147      147              
  Lines        7930     7930              
  Branches       77       77              
==========================================
- Hits         5363     5361       -2     
- Misses       2023     2025       +2     
  Partials      544      544              

Flag	Coverage Δ
unittest-go-macos-latest	66.53% <ø> (+0.10%)	⬆️
unittest-go-ubuntu-latest	67.44% <ø> (-0.09%)	⬇️
unittest-go-windows-2022	65.95% <ø> (+0.01%)	⬆️
unittest-js	64.16% <ø> (ø)

Impacted Files	Coverage Δ
coderd/provisionerdaemons.go	60.20% <0.00%> (-0.60%)	⬇️
peer/conn.go	79.02% <0.00%> (+0.25%)	⬆️

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