[circt-verilog-lsp] Add definition and reference providers #8280
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This commit adds "Go to Definition" and "Find References" functionality to the CIRCT Verilog LSP server. These features allow users to navigate between symbol definitions and usages within Verilog source files. Besides it provides cross references for source location comments.
Following PDLL's LSP implementation, the implementation uses an IntervalMap to efficiently map source positions
to symbols, allowing quick lookups when users request definitions or references. It also supports source location annotations in comments that can link to external source files, enabling cross-language navigation.