gh-105481: split opcode_ids.h out of opcode.h so that it can be generated separately (#107866)

Author: iritkatriel

.gitattributes

@@ -75,6 +75,7 @@ Include/internal/pycore_opcode.h                    generated
 Include/internal/pycore_opcode_metadata.h           generated
 Include/internal/pycore_*_generated.h               generated
 Include/opcode.h                                    generated
+Include/opcode_ids.h                                generated
 Include/token.h                                     generated
 Lib/_opcode_metadata.py                             generated
 Lib/keyword.py                                      generated