schema-wasm: optimize for `-Oz` with LLVM and Binaryen #12018

Job	Run time
Test vitess_5_7 (graphql) on Linux	2m 34s
Test vitess_5_7 (json) on Linux	1m 53s
Test vitess_8_0 (graphql) on Linux	1m 45s
Test vitess_8_0 (json) on Linux	2m 11s
Test postgres15 (graphql) on Linux	13m 46s
Test postgres15 (json) on Linux	14m 48s
Test mssql_2022 (graphql) on Linux	8m 28s
Test mssql_2022 (json) on Linux	10m 37s
Test mongodb_4_2 (graphql) on Linux	4m 4s
Test mongodb_4_2 (json) on Linux	3m 29s
Test cockroach_23_1 (graphql) on Linux	29m 54s
Test cockroach_23_1 (json) on Linux	31m 50s
Test cockroach_22_2 (graphql) on Linux	22m 11s
Test cockroach_22_2 (json) on Linux	17m 7s
Test cockroach_22_1_0 (graphql) on Linux	16m 30s
Test cockroach_22_1_0 (json) on Linux	31m 41s
	3h 32m 48s

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