Implement address compilation

[dspinellis]

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[Copilot]

Pull Request Overview

This PR introduces enhancements for address compilation in sed by adding a new module, additional functionality, and documentation updates.

• Added a new module (delimited_parser) in sed.rs
• Added a new "retreat" helper function to ScriptCharProvider
• Provided a default implementation for Command and updated the README with new extension details

Reviewed Changes

Copilot reviewed 6 out of 6 changed files in this pull request and generated no comments.

File	Description
src/uu/sed/src/sed.rs	New module added to support delimited parsing functionality.
src/uu/sed/src/script_char_provider.rs	Added a new retreat function to adjust the character position.
src/uu/sed/src/command.rs	Introduced a default implementation for Command.
README.md	Enhanced documentation with extension details.

Comments suppressed due to low confidence (1)

src/uu/sed/src/script_char_provider.rs:32

• Consider adding unit tests for the new 'retreat' function to verify its behavior on boundary conditions (e.g., when n is greater than or equal to the current position).

pub fn retreat(&mut self, n: usize) {

[Copilot]

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[dspinellis]

I also added unit tests for the new 'retreat' function.