Expose `rb_execarg` interfaces and `rb_grantpt`
struct rb_execarg has been added 9 years ago, and the latest change on functions deal with it was 3 years ago.
Also, it has been 3 years since
rb_grantpt was added.
These seem stable enough to expose now, but are still internal, and stopping pty from becoming a gem.
rb_grantpt can be more generic, e.g., calling a function with supspending
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