feat: Add Rv32HintLoadByKey

[nyunyunyunyu]

• Add kv_store into Streams. More details at docs/specs/ISA.md.
• Add a new phantom instruction Rv32HintLoadByKey which can hint data based on a key at runtime. More details at docs/specs/ISA.md.
• SDK support will be added in the future PRs.

close INT-3893

[github-actions]

group	app.proof_time_ms	app.cycles	app.cells_used	leaf.proof_time_ms	leaf.cycles	leaf.cells_used
verify_fibair	(-33 [-2.6%]) 1,258	334,142	17,677,298	-	-	-
fibonacci_program	(+8 [+0.3%]) 2,689	1,500,277	50,589,503	-	-	-
regex_program	(-23 [-0.3%]) 8,065	4,165,226	166,511,152	-	-	-
ecrecover_program	(-61 [-4.1%]) 1,432	289,447	14,470,186	-	-	-
pairing	(-18 [-0.4%]) 4,888	1,820,436	95,832,407	-	-	-

Commit: 5efa1a9

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