Changes:

1. Enabling IN/OUT/INOUT mode for sql_mode=DEFAULT,
   adding tests for sql_mode=DEFAULT based by mostly
   translating compat/oracle.sp-inout.test to SQL/PSM
   with minor changes (e.g. testing trigger OLD.column and
   NEW.column as IN/OUT parameters).

2. Removing duplicate grammar:
   sp_pdparam and sp_fdparam implemented exactly the same syntax after
   - the first patch for MDEV-10654 (for sql_mode=ORACLE)
   - the change #1 from this patch (for sql_mode=DEFAULT)
   Removing separate rules and adding a single "sp_param" rule instead,
   which now covers both PRDEDURE and FUNCTION parameters
   (and CURSOR parameters as well!).

3. Adding a helper rule sp_param_name_and_mode, which is a combination
   of the parameter name and the IN/OUT/INOUT mode. It allows to simplify
   the grammer a bit.

4. The first patch unintentionally allowed IN/OUT/INOUT mode
  to be specified in CURSOR parameters.
  This is good for the IN keyword - it is allowed in PL/SQL CURSORs.
  This is not good the the OUT/INOUT keywords - they should not be allowed.
  Adding a additional symantic post-check.