perf(bash/bashrc): add `clear` and `cl` commands to be ignored for command history
perf(bash/bashrc): add `clear` and `cl` commands to be ignored for command history

- `clear` command is to be ignored by command history
- `cl` command (alias to `clear`) is to be ignored by command history

shoichiaizawa/dotfiles,shoichiaizawa/dotfiles,shoichiaizawa/dotfiles