Update clang-format rules

[elshize]

Updates the clang-format rules and reformats all source files. A current version of clang-format is also used instead of 9.

Fixes #557

[codecov]

Codecov Report

Attention: 21 lines in your changes are missing coverage. Please review.

Comparison is base (9ec5817) 93.21% compared to head (bf6bb37) 93.21%.

Files	Patch %	Lines
include/pisa/payload_vector.hpp	88.37%	5 Missing ⚠️
include/pisa/wand_data_compressed.hpp	81.25%	3 Missing ⚠️
include/pisa/wand_data_range.hpp	70.00%	3 Missing ⚠️
include/pisa/cursor/block_max_scored_cursor.hpp	60.00%	2 Missing ⚠️
include/pisa/wand_data.hpp	77.77%	2 Missing ⚠️
include/pisa/accumulator/lazy_accumulator.hpp	83.33%	1 Missing ⚠️
include/pisa/block_freq_index.hpp	92.30%	1 Missing ⚠️
include/pisa/codec/varintgb.hpp	83.33%	1 Missing ⚠️
include/pisa/freq_index.hpp	90.90%	1 Missing ⚠️
include/pisa/linear_quantizer.hpp	66.66%	1 Missing ⚠️
... and 1 more

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #559   +/-   ##
=======================================
  Coverage   93.21%   93.21%           
=======================================
  Files          91       91           
  Lines        4508     4483   -25     
=======================================
- Hits         4202     4179   -23     
+ Misses        306      304    -2     

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