WIP: Build slepc

[chapman39]

This PR rebuilds Serac TPLs and adds SLEPc as an additional TPL. Leveraging SLEPc will help Serac solve eigenvalue problems.

• [ ] Add SLEPc as an additional TPL
• [ ] Add a simple SLEPc smoke test
• [ ] Rebuild TPLs

Fixes #1099

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 92.50000% with 6 lines in your changes are missing coverage. Please review.

Project coverage is 90.59%. Comparing base (ad37e72) to head (96c600a).

:exclamation: Current head 96c600a differs from pull request most recent head 50d02ea. Consider uploading reports for the commit 50d02ea to get more accurate results

Files	Patch %	Lines
src/tests/slepc_smoketest.cpp	92.50%	6 Missing :warning:

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1102      +/-   ##
===========================================
+ Coverage    90.58%   90.59%   +0.01%     
===========================================
  Files          160      161       +1     
  Lines        14331    14412      +81     
===========================================
+ Hits         12982    13057      +75     
- Misses        1349     1355       +6     

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