feat: lets block for bundles #5090

Job	Run time
discover	7s
benchmarks (stdlib)	9m 53s
benchmarks (hcl/eval)	6m 12s
benchmarks (benchmarks/changed)	3m 41s
benchmarks (ls)	21m 22s
benchmarks (generate)	4m 17s
benchmarks (cloud)	4m 49s
benchmarks (hcl/ast)	4m 45s
benchmarks (fs)	2m 16s
benchmarks (tg)	2m 21s
report	11s
	59m 54s

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