gh-105481: generate _specializations and _specialized_instructions from bytecodes.c

[iritkatriel]

This generates the metadata about specialised opcodes from bytecodes.c, to replace the hard coded dict in opcode.py.

There is one irregularity that I needed to special-case: BINARY_OP_INPLACE_ADD_UNICODE, which is commented out in bytecodes.c (because it has different stack effect compared to the rest of the family).

• Issue: Generate opcode metadata from bytecodes.c instead of opcode.py #105481

[markshannon]

We should move the optimization in BINARY_OP_INPLACE_ADD_UNICODE to tier 2, once it we have a tier 2 optimizer. It makes sense there, but not in tier 1.
For now we can just remove it. I suspect BINARY_OP_INPLACE_ADD_UNICODE is not safe for PEP 669 anyway.
#100982

[markshannon]

Looks like summarize_stats.py needs updating

[gvanrossum]

LGTM. One nit; no need to get another review if you decide to fix that. Also okay to merge as-is.