Remove BOOST_BEAST_USE_STD_STRING_VIEW

[sehe]

Fixes #2363

[cppalliance-bot]

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[vinniefalco]

We can't just remove it, we have to deprecate it first for at least one release

[sehe]

Does that include a preprocessor warning (well, error, for portability) when it's used? Or just a deprecation notice in the release notes

[vinniefalco]

it should be an error or warning unless they define BOOST_BEAST_ALLOW_DEPRECATED or something like that.

[cppalliance-bot]

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[vinniefalco]

This needs to be squashed, with authorship preserved, and the commit message edited to reflect the semantics of the change, i.e. "std::string_view is not an option"

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[codecov[bot]]

Codecov Report

Merging #2451 (6869502) into develop (12c2d14) will not change coverage. The diff coverage is n/a.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #2451   +/-   ##
========================================
  Coverage    94.72%   94.72%           
========================================
  Files          152      152           
  Lines        11881    11881           
========================================
  Hits         11254    11254           
  Misses         627      627           

Impacted Files	Coverage Δ
include/boost/beast/core/string_type.hpp	100.00% <ø> (ø)

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