Recover Struct Field Tags and Interface Method Names in GoReSym

This project adds two missing features: struct field tag extraction and interface method name recovery. Tags like json:"user_id" tell a reverse engineer how data is serialized over the network; Go stores them in the binary even after stripping, but GoReSym was not reading them. This project extends the parser to recover tags across all supported Go versions (1.5–1.26) and completes interface method name extraction, with test coverage added for both.