feat: make guess types configurable

[olavloite]

Makes the 'guess types' feature configurable and only enabled by default for JDBC. The reason that this is required for JDBC is that JDBC can use a couple of legacy date/time classes (java.sql.Date and java.sql.Timestamp). These are always sent as untyped parameters by JDBC, which means that we some times need to guess the type based purely on the value that we receive.

[codecov]

Codecov Report

Merging #347 (850108b) into postgresql-dialect (0cedf15) will increase coverage by 0.07%.
The diff coverage is 96.96%.

@@                   Coverage Diff                    @@
##             postgresql-dialect     #347      +/-   ##
========================================================
+ Coverage                 86.32%   86.40%   +0.07%     
- Complexity                 1809     1816       +7     
========================================================
  Files                       121      121              
  Lines                      5975     6002      +27     
  Branches                    818      820       +2     
========================================================
+ Hits                       5158     5186      +28     
+ Misses                      592      589       -3     
- Partials                    225      227       +2     

Flag	Coverage Δ
all_tests	86.40% <96.96%> (+0.07%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
.../cloud/spanner/pgadapter/session/SessionState.java	95.53% <93.75%> (-0.18%)	⬇️
...google/cloud/spanner/pgadapter/parsers/Parser.java	84.09% <100.00%> (ø)
...pter/statements/IntermediatePreparedStatement.java	86.01% <100.00%> (+0.44%)	⬆️
...ud/spanner/pgadapter/utils/ClientAutoDetector.java	93.18% <100.00%> (+0.49%)	⬆️
...spanner/pgadapter/wireprotocol/StartupMessage.java	88.23% <100.00%> (+0.48%)	⬆️
...ava/com/google/cloud/spanner/pgadapter/Server.java	48.38% <0.00%> (ø)
...om/google/cloud/spanner/pgadapter/ProxyServer.java	80.92% <0.00%> (+1.31%)	⬆️

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