Add Dune project

[LuAbelt]

Adds exemplary examples from Dune for compile-time variability (Template based)

Based on test cases in dune-pdelab

[codecov]

Codecov Report

Attention: 32 lines in your changes are missing coverage. Please review.

Comparison is base (4601bce) 68.46% compared to head (13b2c26) 68.41%.

Additional details and impacted files

@@             Coverage Diff              @@
##           vara-dev     #794      +/-   ##
============================================
- Coverage     68.46%   68.41%   -0.06%     
============================================
  Files           334      335       +1     
  Lines         25955    26012      +57     
============================================
+ Hits          17771    17796      +25     
- Misses         8184     8216      +32     

Files	Coverage Δ
varats-core/varats/report/gnu_time_report.py	92.14% <ø> (ø)
varats/varats/tools/bb_config.py	100.00% <ø> (ø)
varats/varats/projects/cpp_projects/dune.py	43.85% <43.85%> (ø)

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