PC-HPDDM interface

[JordiManyer]

This PR adds the missing functionality to use the HPDDM library through PETSc.

This PR only adds PETSc wrappers, the actual solver will be added in gridap/GridapSolvers.jl#95

[codecov]

Codecov Report

Attention: Patch coverage is 90.47619% with 4 lines in your changes missing coverage. Please review.

Project coverage is 85.96%. Comparing base (012bba5) to head (96fb6f5).
Report is 50 commits behind head on master.

Files with missing lines	Patch %	Lines
src/PETScIndexSets.jl	90.47%	4 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #110      +/-   ##
==========================================
- Coverage   89.87%   85.96%   -3.92%     
==========================================
  Files           9       10       +1     
  Lines         909      969      +60     
==========================================
+ Hits          817      833      +16     
- Misses         92      136      +44     

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[JordiManyer]

Thanks @prj- for the contribution!

[prj-]

You are most welcome, thank you for teaching me Julia :)