Switch to PRASCore.jl

[josephmckinsey]

Given the recent changes in PRAS.jl, we can remove our copy of PRAS and substitute their own.

We also depend on PRASFiles.jl instead of just PRASCore.jl, but it's only for the exporting, which we could get rid of too.

[codecov]

Codecov Report

Attention: Patch coverage is 76.92308% with 3 lines in your changes missing coverage. Please review.

Project coverage is 47.00%. Comparing base (dcb927a) to head (010964e).
Report is 9 commits behind head on main.

Files with missing lines	Patch %	Lines
src/PRAS2PowerSystems.jl	0.00%	2 Missing ⚠️
src/PowerSystems2PRAS.jl	83.33%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main      #39      +/-   ##
==========================================
- Coverage   50.26%   47.00%   -3.27%     
==========================================
  Files          54       12      -42     
  Lines        3201      751    -2450     
==========================================
- Hits         1609      353    -1256     
+ Misses       1592      398    -1194     

Flag	Coverage Δ
unittests	47.00% <76.92%> (-3.27%)	⬇️

Flags with carried forward coverage won't be shown. Click here to find out more.

Files with missing lines	Coverage Δ
src/SiennaPRASInterface.jl	100.00% <100.00%> (ø)
src/util/parsing/PRAS_export.jl	83.33% <100.00%> (ø)
src/util/parsing/lines_and_interfaces.jl	100.00% <100.00%> (ø)
src/PowerSystems2PRAS.jl	81.53% <83.33%> (ø)
src/PRAS2PowerSystems.jl	0.00% <0.00%> (ø)

[scdhulipala]

Looks good to me.

I don't think there are any specific changes you need to make. Just made a few comments.

Should I just rebase dsc/cleanup off of this one?