Change BASE to OPFaultRollup / Fix TrustedRollup Types

[adraffy]

• change BASE from OPRollup to OPFaultRollup
• change OPRollup examples using BASE to ZORA
• moved TrustedRollup out of /eth/ since it works for all chains
• fixed new TrustedRollup(..., Prover, ...) type
  • could not figure out how to do it the way I wanted
  • using explicit static constructor on each implementation
  • BlockProver has _createFactory() factory generator
• fixed TrustedRollup interaction with call cache
  • permanent index = 0 caused commit cache to fill up with expired signatures
  • new design uses increasing index

[clowestab]

These lines should be removed.

[adraffy]

I think these need to stay for the explanatory value. Otherwise, it might seem logical to add them back but the reasoning is pretty nuanced.

[clowestab]

I agree. It's more that the block doesn't return a Prover directly now, and the former 4 lines still provide the explanatory value.