feat: config inheritance in the VmConfig derive macro

[stephenh-axiom-xyz]

Implements the following:

• VmConfig macro implements config inheritance (via the #[config] attribute in place of #[system])
• Rv32ImConfig inherits base and io from Rv32IConfig
• impl VmExtension for the option of an arbitrary VmExtension

[github-actions]

group	app.proof_time_ms	app.cycles	app.cells_used	leaf.proof_time_ms	leaf.cycles	leaf.cells_used
verify_fibair	(+14 [+0.6%]) 2,344	513,457	19,359,162	-	-	-
fibonacci_program	(+18 [+0.3%]) 6,115	1,500,092	51,484,605	-	-	-
regex_program	(+714 [+4.0%]) 18,550	4,139,836	163,833,427	-	-	-
ecrecover_program	(-10 [-0.4%]) 2,599	284,561	15,054,935	-	-	-

Commit: e7d9558

Benchmark Workflow

[jonathanpwang]

@Golovanov399 if you get a chance can you review

[Golovanov399]

Seems good
Although I didn't really understand the point of impl VmExtension for Option