dialects: (builtin) add support for f16 packing and unpacking

[jorendumoulin]

The "<e" comes with the following warning:

The IEEE 754 binary16 “half precision” type was introduced in the 2008 revision of the IEEE 754 standard. It has a sign bit, a 5-bit exponent and 11-bit precision (with 10 bits explicitly stored), and can represent numbers between approximately 6.1e-05 and 6.5e+04 at full precision. This type is not widely supported by C compilers: on a typical machine, an unsigned short can be used for storage, but not for math operations. See the Wikipedia page on the half-precision floating-point format for more information.

As we only use it for storage, this should be fine though imo

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 90.39%. Comparing base (b88d7ad) to head (9398818).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #3605   +/-   ##
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  Coverage   90.39%   90.39%           
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  Files         469      469           
  Lines       59098    59102    +4     
  Branches     5616     5616           
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+ Hits        53419    53423    +4     
  Misses       4232     4232           
  Partials     1447     1447           

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[superlopuh]

Thank you