Support compile time bit count for BitPacked mappings

[bernhardmgruber]

This PR adds the ability to specify the bit count for the BitPackedIntSoA mapping and the exponent/mantissa bit counts for the BitPackedFloatSoA mappings at compile time.

It furthermore disables the clang-tidy check fuchsia-statically-constructed-objects, because it is too noisy in the unit test code.

[codecov]

Codecov Report

Merging #446 (5553f6d) into develop (b2374e9) will increase coverage by 0.00%.
The diff coverage is 100.00%.

❗ Current head 5553f6d differs from pull request most recent head 28cb7fd. Consider uploading reports for the commit 28cb7fd to get more accurate results

@@           Coverage Diff            @@
##           develop     #446   +/-   ##
========================================
  Coverage    99.21%   99.22%           
========================================
  Files           59       59           
  Lines         5233     5292   +59     
========================================
+ Hits          5192     5251   +59     
  Misses          41       41           

Impacted Files	Coverage Δ
tests/core.cpp	100.00% <ø> (ø)
include/llama/Core.hpp	94.87% <100.00%> (+0.27%)	⬆️
include/llama/mapping/BitPackedFloatSoA.hpp	100.00% <100.00%> (ø)
include/llama/mapping/BitPackedIntSoA.hpp	100.00% <100.00%> (ø)
tests/dump.cpp	99.01% <100.00%> (ø)
tests/mapping.BitPackedFloatSoA.cpp	100.00% <100.00%> (ø)
tests/mapping.BitPackedIntSoA.cpp	100.00% <100.00%> (ø)
tests/mapping.Bytesplit.cpp	100.00% <100.00%> (ø)
tests/mapping.Split.cpp	100.00% <100.00%> (ø)
tests/proxyrefopmixin.cpp	100.00% <100.00%> (ø)
... and 2 more

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