refactor(language_server): move structs into own file #24757

Job	Run time
Benchmark (lexer)	1m 20s
Build Linter Benchmark	2m 48s
Benchmark (parser)	1m 31s
Benchmark (transformer)	2m 3s
Benchmark (isolated_declarations)	2m 11s
Benchmark (semantic)	1m 42s
Benchmark (minifier)	2m 11s
Benchmark (codegen)	2m 4s
Benchmark linter (0)	3m 0s
Benchmark linter (1)	1m 46s
Upload benchmarks	15s
	20m 51s

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