Rust: expose more rust-analyzer config knobs

[redsun82]

TODO: expose all or at least some of the new config fields as official extractor options. Depending on how the review goes for this one, I might do that in a follow-up PR.

[Copilot]

PR Overview

This pull request exposes more rust-analyzer configuration knobs by adding new deserialization functions for vectors and maps, updating config field definitions, and adjusting workspace loading APIs. Key changes include:

• Introducing a new module (deserialize.rs) to handle newline/comma-separated strings.
• Merging duplicate deserialization logic by removing the former deserialize_vec.rs.
• Expanding the configuration options in the Config struct (e.g. sysroot, rustc_src, build_script_command, extra_includes, and proc_macro_server).
• Modifying the cargo configuration construction and workspace loading functions in both config.rs and rust_analyzer.rs.
• Adjusting the procedural macro in macros/src/lib.rs to use the updated deserialization functions.

Changes

File	Description
rust/extractor/src/config/deserialize.rs	Adds new vector and map deserialization visitors and functions for comma/newline separated strings.
rust/extractor/src/config.rs	Updates the Config struct and related functions to expose additional fields and refactors cargo config logic.
rust/extractor/macros/src/lib.rs	Updates macro attribute usage to employ the new deserialization functions with adjusted type checks.
rust/extractor/src/main.rs	Modifies workspace loading code to pass the new LoadCargoConfig parameter.
rust/extractor/src/rust_analyzer.rs	Adjusts the load_workspace API to remove unused proc_macro_server references.
rust/extractor/src/config/deserialize_vec.rs	Removes legacy duplicate deserialization logic.

Copilot reviewed 6 out of 6 changed files in this pull request and generated 1 comment.

Comments suppressed due to low confidence (1)

rust/extractor/src/config.rs:217

• [nitpick] Consider renaming 'join_path_buf' to a name such as 'join_abs_path' for better clarity regarding its purpose of joining an absolute path with a UTF-8 path.

fn join_path_buf(lhs: &AbsPath, rhs: &Path) -> AbsPathBuf {

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[aibaars]

Looks good to me, just a minor question.

[aibaars]

Question: does display work correctly if rhs contains non-utf8 data? We wouldn't like to cause an additional panic while trying to display an informative error message.