feat: Add custom completer for cargo remove <TAB>

[motorailgun]

fix #15656

What does this PR try to resolve?

This PR implements custom TAB completer for cargo remove <package_name>.

How to test and review this PR?

This patch works like this:

$ cat Cargo.toml
[package]
name = "sandbox"
version = "0.1.0"
edition = "2024"

[dependencies]
rand = "0.9.1"
serde_json = "1"

$ ~/cargo/target/debug/cargo remove 
completing values
--build          -- Remove from build-dependencies
--color          -- Coloring
--config         -- Override a configuration value
--dev            -- Remove from dev-dependencies
--dry-run        -- Don't actually write the manifest
--frozen         -- Equivalent to specifying both --locked and --offline
--help           -- Print help
--locked         -- Assert that `Cargo.lock` will remain unchanged
--lockfile-path  -- Path to Cargo.lock (unstable)
--manifest-path  -- Path to Cargo.toml
--offline        -- Run without accessing the network
--package        -- Package to remove from
--quiet          -- Do not print cargo log messages
--target         -- Remove from target-dependencies
--verbose        -- Use verbose output (-vv very verbose/build.rs output)
-Z               -- Unstable (nightly-only) flags to Cargo, see 'cargo -Z help' for details
rand        serde_json

(on zsh)

[rustbot]

r? @weihanglo

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[epage]

Thanks!