Replace custom opcodes with CPython standard sequences by youknowone · Pull Request #6794 · RustPython/RustPython

* Replace custom opcodes with standard sequences

Remove RustPython-specific opcodes (BuildListFromTuples,
BuildMapForCall, BuildSetFromTuples, BuildTupleFromTuples)
and replace their usage with CPython 3.14 standard opcode
sequences:

- BuildListFromTuples → BUILD_LIST + LIST_EXTEND loop
- BuildSetFromTuples → BUILD_SET + SET_UPDATE loop
- BuildTupleFromTuples → BUILD_LIST + LIST_EXTEND + CALL_INTRINSIC_1(ListToTuple)
- BuildMapForCall → DICT_MERGE loop

Implement missing opcodes:
- ListExtend: Extend list with iterable elements
- SetUpdate: Add iterable elements to set
- DictMerge: Merge dict with duplicate key checking

* Auto-generate: generate_opcode_metadata.py

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