laurenz/oracle_fdw ORACLE_FDW_2_7

Note: Building and running oracle_fdw with old minor releases may fail; see the installation requirement documentation for details.

Bugfixes

Don't push down LIMIT without an ORDER BY clause.
This can lead to wrong results in some cases.
Report by @fbattke.

Fix support for query parameters of type uuid.
This led to errors like

error executing query: OCINumberFromText failed to convert parameter
OCI-22062: invalid input string [8feee298-7ce5-4761-9487-34cab831fead]

Report by @VictorRas.

Fix a memory leak in statements that return LOBs.
The memory for LOB locators didn't get released before the end of the transaction, so running many statements in a single transaction could cause out-of-memory errors and server crashes.
Report by @JosefMachytkaNetApp.
Fix building on Windows with PostgreSQL versions older than v15.
This used to report "unresolved external symbol XactReadOnly".
Report by @w0pr.
Fix crash or empty result when reading larger CLOBs.
Report by @sabineWalter and @vlisterik.
Bind empty string parameters as NULL values.
Failure to do that led to the error
```
ORA-01459: invalid length for variable character string
```
during the attempt to INSERT empty strings in a foreign table.
Report by @adrianboangiu and @intgr.

Speed up IMPORT FOREIGN SCHEMA ... LIMIT TO (...) by filtering out tables whose name don't match on the Oracle side.
Per suggestion from @joaostorrer.
Add options skip_tables, skip_views and skip_matviews to IMPORT FOREIGN SCHEMA.
From a patch by @mkgrgis.