Since universal-parser and prism support, prelude code used functions
inaccessible from outside libruby shared library.

```
linking goruby
/usr/bin/ld: goruby.o: in function `prelude_eval':
/home/runner/work/ruby/ruby/build/golf_prelude.c:221: undefined reference to `rb_ruby_prism_ptr'
/usr/bin/ld: goruby.o: in function `pm_prelude_load':
/home/runner/work/ruby/ruby/build/golf_prelude.c:192: undefined reference to `pm_options_line_set'
/usr/bin/ld: /home/runner/work/ruby/ruby/build/golf_prelude.c:193: undefined reference to `pm_parse_string'
/usr/bin/ld: goruby.o: in function `prelude_eval':
/home/runner/work/ruby/ruby/build/golf_prelude.c:224: undefined reference to `pm_iseq_new_with_opt'
/usr/bin/ld: /home/runner/work/ruby/ruby/build/golf_prelude.c:226: undefined reference to `pm_parse_result_free'
/usr/bin/ld: goruby.o: in function `prelude_ast_value':
/home/runner/work/ruby/ruby/build/golf_prelude.c:181: undefined reference to `rb_ruby_ast_data_get'
/usr/bin/ld: goruby.o: in function `prelude_eval':
/home/runner/work/ruby/ruby/build/golf_prelude.c:231: undefined reference to `rb_ruby_ast_data_get'
/usr/bin/ld: goruby.o: in function `pm_prelude_load':
/home/runner/work/ruby/ruby/build/golf_prelude.c:196: undefined reference to `pm_parse_result_free'
collect2: error: ld returned 1 exit status
```

Refactor out the same code from `rb_builtin_ast_value` and
`pm_builtin_ast_value.

There is an English word "vast".
This commit changes the name to be more clear name to avoid confusion.

This patch removes the `VALUE flags` member from the `rb_ast_t` structure making `rb_ast_t` no longer an IMEMO object.

## Background

We are trying to make the Ruby parser generated from parse.y a universal parser that can be used by other implementations such as mruby.
To achieve this, it is necessary to exclude VALUE and IMEMO from parse.y, AST, and NODE.

## Summary (file by file)

- `rubyparser.h`
  - Remove the `VALUE flags` member from `rb_ast_t`
- `ruby_parser.c` and `internal/ruby_parser.h`
  - Use TypedData_Make_Struct VALUE which wraps `rb_ast_t` `in ast_alloc()` so that GC can manage it
    - You can retrieve `rb_ast_t` from the VALUE by `rb_ruby_ast_data_get()`
  - Change the return type of `rb_parser_compile_XXXX()` functions from `rb_ast_t *` to `VALUE`
  - rb_ruby_ast_new() which internally `calls ast_alloc()` is to create VALUE vast outside ruby_parser.c
- `iseq.c` and `vm_core.h`
  - Amend the first parameter of `rb_iseq_new_XXXX()` functions from `rb_ast_body_t *` to `VALUE`
  - This keeps the VALUE of AST on the machine stack to prevent being removed by GC
- `ast.c`
  - Almost all change is replacement `rb_ast_t *ast` with `VALUE vast` (sorry for the big diff)
  - Fix `node_memsize()`
    - Now it includes `rb_ast_local_table_link`, `tokens` and script_lines
- `compile.c`, `load.c`, `node.c`, `parse.y`, `proc.c`, `ruby.c`, `template/prelude.c.tmpl`, `vm.c` and `vm_eval.c`
  - Follow-up due to the above changes
- `imemo.{c|h}`
  - If an object with `imemo_ast` appears, considers it a bug

Co-authored-by: Nobuyoshi Nakada <nobu@ruby-lang.org>

This patch is part of universal parser work.

## Summary
- Decouple VALUE from members below:
  - `(struct parser_params *)->debug_lines`
  - `(rb_ast_t *)->body.script_lines`
- Instead, they are now `rb_parser_ary_t *`
  - They can also be a `(VALUE)FIXNUM` as before to hold line count
- `ISEQ_BODY(iseq)->variable.script_lines` remains VALUE
  - In order to do this,
  - Add `VALUE script_lines` param to `rb_iseq_new_with_opt()`
  - Introduce `rb_parser_build_script_lines_from()` to convert `rb_parser_ary_t *` into `VALUE`

## Other details
- Extend `rb_parser_ary_t *`. It previously could only store `rb_parser_ast_token *`, now can store script_lines, too
- Change tactics of building the top-level `SCRIPT_LINES__` in `yycompile0()`
  - Before: While parsing, each line of the script is added to `SCRIPT_LINES__[path]`
  - After: After `yyparse(p)`, `SCRIPT_LINES__[path]` will be built from `p->debug_lines`
- Remove the second parameter of `rb_parser_set_script_lines()` to make it simple
- Introduce `script_lines_free()` to be called from `rb_ast_free()` because the GC no longer takes care of the script_lines
- Introduce `rb_parser_string_deep_copy()` in parse.y to maintain script_lines when `rb_ruby_parser_free()` called
  - With regard to this, please see *Future tasks* below

## Future tasks
- Decouple IMEMO from `rb_ast_t *`
  - This lifts the five-members-restriction of Ruby object,
  - So we will be able to move the ownership of the `lex.string_buffer` from parser to AST
  - Then we remove `rb_parser_string_deep_copy()` to make the whole thing simple

Non-ASCII code are often warned by localized compilers.