Refactor FileStream and HiCFileWriter to be more robust against data races

[robomics]

This PR introduces two main changes:

• updating the FileStream class to expose several member functions to perform atomic reads and writes to binary files
• updating HiCFileWriter to take advantage of the new FileStream functionality
• optimize serialization of .hic files (the optimizations are especially noticeable when writing .hic files using a low number of threads)

[codecov]

Codecov Report

Attention: Patch coverage is 87.83270% with 96 lines in your changes missing coverage. Please review.

Project coverage is 79.31%. Comparing base (9fd7986) to head (c854b2b).

Files with missing lines	Patch %	Lines
...tk/hic/include/hictk/hic/impl/file_writer_impl.hpp	87.75%	25 Missing and 5 partials ⚠️
...ictk/hic/impl/file_writer_data_structures_impl.hpp	57.35%	28 Missing and 1 partial ⚠️
.../filestream/include/hictk/impl/filestream_impl.hpp	94.65%	8 Missing and 6 partials ⚠️
...de/hictk/hic/impl/serialized_block_pqueue_impl.hpp	92.47%	3 Missing and 4 partials ⚠️
...tk/hic/include/hictk/hic/impl/file_reader_impl.hpp	61.53%	1 Missing and 4 partials ⚠️
...ictk/hic/impl/interaction_to_block_mapper_impl.hpp	55.55%	2 Missing and 2 partials ⚠️
...ibhictk/hic/include/hictk/hic/impl/header_impl.hpp	90.90%	1 Missing and 2 partials ⚠️
...y_buffer/include/hictk/impl/binary_buffer_impl.hpp	71.42%	1 Missing and 1 partial ⚠️
.../include/hictk/hic/interaction_to_block_mapper.hpp	60.00%	1 Missing and 1 partial ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #275      +/-   ##
==========================================
+ Coverage   79.08%   79.31%   +0.22%     
==========================================
  Files         171      173       +2     
  Lines       16482    16794     +312     
  Branches     2278     2302      +24     
==========================================
+ Hits        13035    13320     +285     
- Misses       2450     2469      +19     
- Partials      997     1005       +8     

Flag	Coverage Δ
[tests	integration](https://app.codecov.io/gh/paulsengroup/hictk/pull/275/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=paulsengroup)	69.74% <83.96%> (+0.20%)
[tests	unittests](https://app.codecov.io/gh/paulsengroup/hictk/pull/275/flags?src=pr&el=flag&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=paulsengroup)	77.36% <86.43%> (+0.81%)

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[robomics]

Superseded by #282