Make generated macros consistent with UPPER_CASE convention

[knoepfel]

Pursuant to #322 (comment)

[pcanal]

Thanks.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.

@@            Coverage Diff             @@
##             main     #483      +/-   ##
==========================================
- Coverage   85.49%   85.47%   -0.03%     
==========================================
  Files         142      142              
  Lines        3586     3586              
  Branches      615      615              
==========================================
- Hits         3066     3065       -1     
  Misses        310      310              
- Partials      210      211       +1     

Flag	Coverage Δ
unittests	85.47% <ø> (-0.03%)	⬇️

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

Files with missing lines	Coverage Δ
phlex/configuration.hpp	100.00% <ø> (ø)
phlex/core/declared_fold.hpp	95.31% <ø> (ø)
phlex/core/declared_observer.hpp	100.00% <ø> (ø)
phlex/core/declared_output.hpp	100.00% <ø> (ø)
phlex/core/declared_predicate.hpp	94.73% <ø> (ø)
phlex/core/declared_provider.hpp	100.00% <ø> (ø)
phlex/core/declared_transform.hpp	88.57% <ø> (ø)
phlex/core/declared_unfold.hpp	96.42% <ø> (ø)
phlex/core/detail/filter_impl.hpp	100.00% <ø> (ø)
phlex/core/edge_creation_policy.hpp	100.00% <ø> (ø)
... and 22 more

... and 2 files with indirect coverage changes

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