perf(codegen): split line offsets table into 2 parts

[overlookmotel]

WIP

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[overlookmotel]

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• perf(codegen): split line offsets table into 2 parts #4648 👈
• perf(codegen): reduce size of LineOffsetTable #4643
• perf(codegen): u32 indexes in LineOffsetTable for source maps #4641
• main

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[codspeed-hq]

CodSpeed Performance Report

Merging #4648 will not alter performance

_{Comparing 08-05-perf_codegen_split_line_offsets_table_into_2_parts (f2604f7) with 08-05-perf_codegen_reduce_size_of_lineoffsettable_ (150ccb0)}

Summary

✅ 32 untouched benchmarks

[overlookmotel]

Have merged these changes into #4643.