rb_ary_new function was not used by the parser and could be removed.

Changed to use `rb_parser_is_ascii_string` function instead of `is_ascii_string` function

This change is reduce Ruby C API dependency for Universal Parser.
Reuse dedent_string functions in rb_ruby_ripper_dedent_string functions and remove dependencies on rb_str_modify and rb_str_set_len from the parser.

StringValueCStr has not used in parse.y

Recently, `TestRubyLiteral#test_float` fails randomly.

```
  1) Error:
TestRubyLiteral#test_float:
ArgumentError: SyntaxError#path changed: "(eval at /home/chkbuild/chkbuild/tmp/build/20240527T050036Z/ruby/test/ruby/test_literal.rb:642)"->"(eval at /home/chkbuild/chkbuild/tmp/build/20240527T050036Z/ruby/test/ruby/test_literal.rb:642)"
```
https://rubyci.s3.amazonaws.com/s390x/ruby-master/log/20240527T050036Z.fail.html.gz

According to Launchable, the first failure was on Apr 30.
This is just when 528c4501f46fbe1e06028d673a777ef124d29829 was
committed. I don't know if the change is really the cause, but I want to
revert it once to see if the random failure disappears.

Fixed warning about discarding modifiers.

```
../src/ruby_parser.c:677:48: warning: passing 'rb_encoding *' (aka 'const struct OnigEncodingTypeST *') to parameter of type 'void *' discards qualifiers [-Wincompatible-pointer-types-discards-qualifiers]
  677 |     ast = rb_parser_compile(p, gets, ptr, len, enc, input, line);
      |                                                ^~~
../src/internal/parse.h:58:128: note: passing argument to parameter 'fname_enc' here
   58 | rb_ast_t *rb_parser_compile(rb_parser_t *p, rb_parser_lex_gets_func *gets, const char *fname_ptr, long fname_len, rb_encoding *fname_enc, rb_parser_input_data input, int line);
      |                                                                                                                                ^
```

This reduces dependency on VALUE.