Reject non-pure decimal tuple indexes.

Tuple indexes should be pure decimal integer literals. But the parser just sees an
integer literal. Fix this by introducing a new type hint CORETYPE_PURE_DECIMAL. This
doesn't conflict with any existing type hints since a pure decimal doesn't have a
type suffix.

Introduce a new method is_pure_decimal that the parser can use in parse_tuple_index_expr.
get_type_hint will return CORETYPE_UNKNOWN for pure decimals.

parse_decimal_int_or_float will check whether there are no execissive leading zeros.
parse_in_decimal checks the literal doesn't contain any underscores.

Add two testcases. bad_tuple_index.rs with all variants of integer literals which aren't
pure decimals. And tuple_index.rs with various correct tuple indexes.

Resolves: https://github.com/Rust-GCC/gccrs/issues/511

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