get_executor() works on initiation objects

[ashtum]

This is required for the new asio::cancel_at and asio::cancel_after completion token adapters to work.

[codecov]

Codecov Report

Attention: Patch coverage is 58.06452% with 26 lines in your changes missing coverage. Please review.

Project coverage is 93.09%. Comparing base (1a2b85b) to head (97fc09c).

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #2895      +/-   ##
===========================================
- Coverage    93.23%   93.09%   -0.14%     
===========================================
  Files          177      177              
  Lines        13675    13709      +34     
===========================================
+ Hits         12750    12763      +13     
- Misses         925      946      +21     

Files	Coverage Δ
...boost/beast/_experimental/http/impl/icy_stream.hpp	96.03% <100.00%> (+0.03%)	⬆️
...ude/boost/beast/_experimental/test/impl/stream.hpp	99.31% <100.00%> (ø)
include/boost/beast/core/detect_ssl.hpp	93.93% <100.00%> (+1.51%)	⬆️
...ude/boost/beast/core/impl/buffered_read_stream.hpp	91.52% <100.00%> (+0.14%)	⬆️
include/boost/beast/core/impl/flat_stream.hpp	100.00% <100.00%> (ø)
include/boost/beast/http/impl/read.hpp	98.46% <100.00%> (+<0.01%)	⬆️
include/boost/beast/http/impl/write.hpp	92.07% <100.00%> (+1.71%)	⬆️
include/boost/beast/websocket/impl/close.hpp	95.97% <33.33%> (-0.98%)	⬇️
include/boost/beast/websocket/impl/handshake.hpp	95.62% <60.00%> (-1.42%)	⬇️
include/boost/beast/websocket/impl/ping.hpp	93.65% <50.00%> (-1.52%)	⬇️
... and 4 more

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