deprecate type aliases

[grisumbras]

Fix #881

[cppalliance-bot]

An automated preview of the documentation is available at https://980.jsondocs.prtest.cppalliance.org/libs/json/doc/html/index.html

[cppalliance-bot]

Benchmark test results. More info at https://benchmark.cppalliance.org/jsonbenchmarks-pullrequests/980/pullrequest.html

[cppalliance-bot]

An automated preview of the documentation is available at https://980.jsondocs.prtest.cppalliance.org/libs/json/doc/html/index.html

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Comparison is base (411b9a9) 93.08% compared to head (bacc644) 93.08%.

Additional details and impacted files

@@           Coverage Diff            @@
##           develop     #980   +/-   ##
========================================
  Coverage    93.08%   93.08%           
========================================
  Files           87       87           
  Lines         8122     8122           
========================================
  Hits          7560     7560           
  Misses         562      562           

Files	Coverage Δ
include/boost/json/array.hpp	100.00% <ø> (ø)
include/boost/json/basic_parser.hpp	100.00% <ø> (ø)
include/boost/json/basic_parser_impl.hpp	98.45% <100.00%> (ø)
include/boost/json/detail/default_resource.hpp	83.33% <ø> (ø)
include/boost/json/detail/impl/except.ipp	100.00% <100.00%> (ø)
include/boost/json/detail/impl/handler.ipp	100.00% <ø> (ø)
include/boost/json/detail/parse_into.hpp	100.00% <100.00%> (ø)
include/boost/json/detail/shared_resource.hpp	100.00% <ø> (ø)
include/boost/json/detail/value.hpp	100.00% <ø> (ø)
include/boost/json/detail/value_to.hpp	100.00% <100.00%> (ø)
... and 21 more

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[cppalliance-bot]

Benchmark test results. More info at https://benchmark.cppalliance.org/jsonbenchmarks-pullrequests/980/pullrequest.html

[cppalliance-bot]

An automated preview of the documentation is available at https://980.jsondocs.prtest.cppalliance.org/libs/json/doc/html/index.html

[cppalliance-bot]

Benchmark test results. More info at https://benchmark.cppalliance.org/jsonbenchmarks-pullrequests/980/pullrequest.html