refactor(demo): rename and expand go/types and go/token test demos
- Renamed _demo/go/issue1370_case1 to _demo/go/gotypes
- Renamed _demo/go/issue1370_case2 to _demo/go/gotoken
- Expanded gotypes demo to test comprehensive go/types APIs:
- Basic types (Int, String, Bool, Float64)
- Objects (Var, Const, Func, TypeName)
- Scope operations (Insert, Lookup, Names, Len)
- Package operations
- Named types
- Interface types with methods
- Struct types with fields
- Signature types with params and results
- Tuple operations
- Composite types (Array, Slice, Pointer, Map, Chan)
- Expanded gotoken demo to test comprehensive go/token APIs:
- Pos operations and validation
- Token types (operators, literals, keywords)
- Token methods (String, IsKeyword, Precedence)
- FileSet operations (AddFile, File, Position)
- File operations (AddLine, Pos, Offset, Line, LineStart)
- Position struct and methods
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Co-authored-by: luoliwoshang <51194195+luoliwoshang@users.noreply.github.com>
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