perf: optimize ExecutionReport and create_alu_lookup_id iff mode is trace

[tqn]

Uses the enum-map crate, which provides an associative array interface to an underlying array. It allocates memory proportional to the number of enum variants. In this case, those are the opcodes and syscalls, of which there are 47 and 35 of, respectively.

[github-actions]

SP1 Performance Test Results

Branch: tqn/fewer-hashmaps-in-execution-report
Commit: 76dd23a5
Author: tqn

program	cycles	execute (mHz)	core (kHZ)	compress (KHz)	time	success
fibonacci	11291	0.02	5.52	0.15	1m16s	✅
ssz-withdrawals	2757356	3.59	59.36	22.10	2m52s	✅
tendermint	12593597	5.00	149.90	94.05	3m40s	✅