refactor(semantic): change `Bindings` to a plain `FxHashMap` #24729

Job	Run time
Benchmark (lexer)	1m 16s
Build Linter Benchmark	2m 43s
Benchmark (parser)	1m 42s
Benchmark (transformer)	2m 11s
Benchmark (isolated_declarations)	1m 59s
Benchmark (semantic)	1m 42s
Benchmark (minifier)	1m 58s
Benchmark (codegen)	2m 14s
Benchmark linter (0)	2m 59s
Benchmark linter (1)	1m 36s
Upload benchmarks	23s
	20m 43s

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