fix: unix domain sockets failed for msg size > 8Kb on MacOS

[olavloite]

Domain sockets on MacOS failed if it received a message that was bigger than the reader buffer size (8192 bytes).

[codecov]

Codecov Report

Merging #188 (2a2b9f9) into postgresql-dialect (1bf14c8) will not change coverage.
The diff coverage is 66.66%.

❗ Current head 2a2b9f9 differs from pull request most recent head 2f19fdd. Consider uploading reports for the commit 2f19fdd to get more accurate results

@@                  Coverage Diff                  @@
##             postgresql-dialect     #188   +/-   ##
=====================================================
  Coverage                 79.41%   79.41%           
  Complexity                 1041     1041           
=====================================================
  Files                        91       91           
  Lines                      3561     3561           
  Branches                    423      423           
=====================================================
  Hits                       2828     2828           
  Misses                      568      568           
  Partials                    165      165           

Flag	Coverage Δ
all_tests	79.41% <66.66%> (ø)

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Impacted Files	Coverage Δ
...om/google/cloud/spanner/pgadapter/ProxyServer.java	73.33% <0.00%> (ø)
...gle/cloud/spanner/pgadapter/ConnectionHandler.java	76.52% <100.00%> (ø)

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