op/command_mapper

[drcege]

Added the prototype implementation of CommandMapper, which corresponds to the ScriptOP raised in issue #412. The following issues need discussion:

• Avoid creating subclasses like PythonCodesOperator or BashCodesOperator, as this hinders extensibility. Consider that if users want to support more shell types like zsh, or integrate with other programming languages or third-party tools, they would have to add new classes at the code level, which is cumbersome and unnecessary. With a single CommandMapper, we can maximize support for arbitrary extensions without modifying the source code.

• Operator naming. Currently, the operator is implemented as a mapper; therefore, the Mapper suffix is used instead of the original ScriptOP. Other candidate names include ScriptMapper, CodeMapper, ExternalXXXMapper, etc. I have opted for CommandMapper because it is not limited to just code or scripts; it can actually execute any command, such as pre-compiled binary files.

Everyone is welcome to provide feedback on the above issues, and I will add relevant documentation after reaching a consensus.

[yxdyc]

Good prototype and thoughts on the PR. I concur with the first point regarding avoiding the creation of multiple subclasses for handling different shell environments, programming languages, or tools. This approach does indeed support greater extensibility and reduces code maintenance burdens.

However, I think that abstracting a ScriptOP base class can still be beneficial, especially for purposes related to security and fault tolerance. For example, a unified management interface could be used to restrict high-risk system commands like rm, or to consistently check command return statuses. Additionally, for improved efficiency and flexibility, we could consider maintaining two subclasses with the option for batched=False/True, allowing users to choose the most suitable approach for their needs. For instance:

CommandMapper (command: str = '', batched=False, repair=True)
CommandFilter (command: str = '', batched=False, repair=True)

[drcege]

Moved to #492