Implement Python 3.8 && 3.9 try-except-finally logic

[Levak]

• Add tests for simple cases of try-except-finally (rename one old Python 2.6 test);

• Implement JUMP_IF_NOT_EXC_MATCH_A with a fake CMP_EXCEPTION followed by a POP_JUMP_IF_TRUE;

• Implement BEGIN_FINALLY with a fake LOAD_CONST_A None;

• Implement Python 3.8+ specific SETUP_FINALLY_A handling both EXCEPT and FINALLY cases. We guess which is which by looking at the targeted block that seems to either be a POP_TOP or a DUP_TOP in the case of an EXCEPT block;

• Implement RERAISE with a fake END_FINALLY;

• In Python 3.9+, emulate a BEGIN_FINALLY when POP_BLOCK is not followed by a JUMP_FORWARD_A (maybe source of bugs);

• In Python 3.9+, skip the duplicated code from the FINALLY blocks with a jump in bytecode and a fake END_FINALLY.

[EchoStretch]

Fantastic update! I think this one works the best so far. There are still a few I'm not able to resolve, but I'm reviewing everyone’s repos to get more insights.

Unsupported opcode: LOAD_ASSERTION_ERROR Unsupported opcode: LOAD_ASSERTION_ERROR Unsupported opcode: LOAD_ASSERTION_ERROR Warning: Stack history is not empty! Warning: block stack is not empty! Warning: block stack is not empty! Warning: block stack is not empty! Warning: Stack history is not empty! Warning: block stack is not empty! Unsupported opcode: LOAD_ASSERTION_ERROR Unsupported opcode: LOAD_ASSERTION_ERROR Warning: block stack is not empty! Unsupported opcode: LOAD_ASSERTION_ERROR Unsupported opcode: LOAD_ASSERTION_ERROR