Collect different bison %type declarations into a single chunk

Bison grammar files sql_yacc.yy and sql_yacc_ora.yy has a number of different %type declarations, which are distributed all around the file.
In order to unify the two files easier, let's collect different declarations in a single chunk, like this:

• in sql_yacc.cc:

  /* Start of sql_mode=DEFAULT specific declarations */

  %type <NONE> sp_tail

  %type <NONE> sp_unlabeled_block_not_atomic

  %type <NONE> sp_proc_stmt_in_returns_clause

  %type <lex_str> sp_label

  %type <spblock> sp_decl_handler

  %type <spblock> sp_decls

  %type <spblock> sp_decl

  %type <spblock> sp_decl_body

  %type <spblock> sp_decl_variable_list

  /* End of sql_mode=DEFAULT specific declarations */

• in sql_yacc_ora.yy:

  /* Start of sql_mode=ORACLE specific declarations */

  %type <NONE> set_assign

  %type <NONE> sp_tail_standalone

  %type <NONE> sp_labelable_stmt

  %type <simple_string> remember_end_opt

  %type <lex_str> opt_package_routine_end_name

  %type <lex_str> label_declaration_oracle

  %type <lex_str> labels_declaration_oracle

  %type <kwd> keyword_directly_assignable

  %type <ident_sys> ident_directly_assignable

  %type <ident_cli> ident_cli_directly_assignable

  %type <spname> opt_sp_name

  %type <spblock> sp_decl_body_list

  %type <spblock> opt_sp_decl_body_list

  %type <spblock> sp_decl_vars

  %type <spblock> sp_decl_non_handler

  %type <spblock> sp_decl_non_handler_list

  %type <spblock> sp_decl_handler

  %type <spblock> sp_decl_handler_list

  %type <spblock> opt_sp_decl_handler_list

  %type <spblock> package_implementation_routine_definition

  %type <spblock> package_implementation_item_declaration

  %type <spblock> package_implementation_declare_section

  %type <spblock> package_implementation_declare_section_list1

  %type <spblock> package_implementation_declare_section_list2

  %type <spblock_handlers> sp_block_statements_and_exceptions

  %type <spblock_handlers> package_implementation_executable_section

  %type <sp_instr_addr> sp_instr_addr

  %type <num> opt_exception_clause exception_handlers

  %type <lex> remember_lex

  %type <lex> package_routine_lex

  %type <lex> package_specification_function

  %type <lex> package_specification_procedure

  /* End of sql_mode=ORACLE specific declarations */

so that later we can cut the sql_mode=DEFAULT specific block and replace it to the sql_mode=ORACLE specific block.