[LQP Meta] Add formatted and non-formatted literal tokens

[nystrom]

Summary

In the Julia pretty-printer, we want to obscure some constants (e.g., by hashing them so they don't appear in logs) but not all. For instance, literal values inside formula fragments should go through a ConstantFormatter hook, while values in config relations and attributes should be printed as-is.

This PR introduces formatted literal tokens (FORMATTED_INT, FORMATTED_STRING, etc.) into the grammar as aliases of their unformatted counterparts (INT, STRING, etc.):

• Parsing: formatted tokens are aliases — they use the same lexer rules as the base tokens, so parsing behavior is unchanged.
• Pretty-printing: formatted tokens dispatch to format_*_formatted builtins, which in the Julia SDK go through the ConstantFormatter hook on the PrettyPrinter (allowing RAICode to hash/obscure values). In Go and Python, the formatted variants behave identically to the base formatters.
• Grammar: the value nonterminal (used in formula term) now uses formatted tokens. A new raw_value nonterminal uses plain tokens and is used in config_key_value, attribute, and specialized_value where constants should not be obscured. date/datetime are similarly split into formatted and raw_* variants.

Changes

• grammar.y: Add %token_alias declarations, split value/raw_value and date/datetime/raw_date/raw_datetime, remove the constant nonterminal (was just an alias for value)
• grammar.py, yacc_parser.py: Support %token_alias in grammar representation and parser
• pretty_gen.py: Table-driven terminal formatting with formatted variant entries
• codegen_templates.py, target_builtins.py: Register format_*_formatted builtins for all three target languages
• pretty_printer.jl.template: Add format_int32/format_float32 to the ConstantFormatter protocol; formatted builtins dispatch through pp.constant_formatter, unformatted builtins use DEFAULT_CONSTANT_FORMATTER directly
• Regenerated parsers and pretty-printers for Python, Go, and Julia SDKs

[staworko]

LGTM

[staworko]

That's a nice solution. 🎉