add tests/ folder and ensure all examples can be run

[yasirroni]

Hi, I add some modifications to ensure I can run julia --project=. --color=yes test/runtests.jl to run all cases. Some notable notes are

1. Remove uuid from Project.toml to avoid error on Pkg.precompile(). Since this is not a packages, Julia recommend us to remove it. Let me know if I should not remove it.
2. Pin OrdinaryDiffEq = "=6.103.0" because v6.104 and higher cause compile error. See: fix OrdinaryDiffEq to latest compatible NREL-Sienna/PowerSimulationsDynamics.jl#413
3. Add runtests.jl to loop and run files.
4. Add PSI and PSID to support run all in single Julia instance.
5. Add various packages to Project.toml .