Feature/ecc 1467 grib power single precision

[joobog]

Make grib_power() a template function.

[codecov-commenter]

Codecov Report

Patch coverage: 80.18% and project coverage change: -0.01 ⚠️

Comparison is base (5018eb7) 75.28% compared to head (53a62ee) 75.27%.

Additional details and impacted files

@@             Coverage Diff             @@
##           develop     #134      +/-   ##
===========================================
- Coverage    75.28%   75.27%   -0.01%     
===========================================
  Files          534      535       +1     
  Lines        64499    64501       +2     
===========================================
+ Hits         48555    48556       +1     
- Misses       15944    15945       +1     

Impacted Files	Coverage Δ
src/grib_accessor_class_data_2order_packing.cc	0.00% <0.00%> (ø)
src/grib_accessor_class_data_apply_bitmap.cc	93.82% <ø> (ø)
...lass_data_g1second_order_constant_width_packing.cc	0.00% <0.00%> (ø)
src/grib_accessor_class_data_png_packing.cc	0.00% <ø> (ø)
src/grib_accessor_class_data_raw_packing.cc	90.42% <ø> (ø)
src/grib_accessor_class_data_run_length_packing.cc	0.00% <0.00%> (ø)
src/grib_accessor_class_gen.cc	68.37% <ø> (ø)
src/grib_bits_any_endian.cc	77.15% <ø> (ø)
src/grib_header_compute.cc	0.00% <ø> (ø)
src/grib_scaling.cc	34.56% <16.66%> (-8.77%)	⬇️
... and 22 more

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