feat: Support PreparedStatement.getMetaData()

[mkaufmann]

The JDBC standard supports getMetaData() calls on PreparedStatements even without executing the fully query. This change adds support for this by leveraging the query_row_limit=0 query parameter which instructs Hyper to only produce metadata but not to actually execute the query. But that also means that the query still has to be send to the remote instance and will be checked if it is valid.

Drive-By:

• The Query Param logic was hard to understand being split between multiple places in Statement + ExecuteQueryParamBuilder classes. It turns out that the dedicated param builder class created more complexity than saving and thus the functionality is now inlined in the Statement classes (and restructured there for clearer flow).
• In a previous commit I missed pushing the extended SyncIteratorAdapter + AsyncQueryResultIterator coverage which is now added here.

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 82.70%. Comparing base (b1fba90) to head (9e9c2a5).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@             Coverage Diff              @@
##               main     #151      +/-   ##
============================================
+ Coverage     82.59%   82.70%   +0.10%     
+ Complexity     1350     1345       -5     
============================================
  Files           112      111       -1     
  Lines          4062     4053       -9     
  Branches        413      413              
============================================
- Hits           3355     3352       -3     
+ Misses          515      510       -5     
+ Partials        192      191       -1     

Components	Coverage Δ
JDBC Core	83.86% <100.00%> (+0.14%)	⬆️
JDBC Main	40.69% <ø> (ø)
JDBC HTTP	91.09% <ø> (ø)
JDBC Utilities	66.07% <ø> (ø)
Spark Datasource	∅ <ø> (∅)

Files with missing lines	Coverage Δ
...atacloud/jdbc/core/DataCloudPreparedStatement.java	97.36% <100.00%> (+0.14%)	⬆️
...sforce/datacloud/jdbc/core/DataCloudStatement.java	79.21% <100.00%> (+1.10%)	⬆️

... and 1 file with indirect coverage changes

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