message: fix bril2json load_ -> parse_
diff: use bril2json::cli::Cli;
  -use bril2json::load_abstract_program;
  +use bril2json::parse_abstract_program;
  use bril_rs::output_abstract_program;
  use clap::Parser;
  fn main() {
  let args = Cli::parse();
  - output_abstract_program(&load_abstract_program(args.position))
  + output_abstract_program(&parse_abstract_program(args.position))
  }
  