feat: add support for Mercurial (hg) source handling in mod.rs

- Implemented `split_hg_url` to parse Mercurial URLs and revisions.
- Added `checkout_hg` function to clone Mercurial repositories.
- Integrated Mercurial handling into the `prepare_one` function to support resuming builds.
- Added tests for `split_hg_url` to ensure correct parsing of URLs and revisions.

---

feat: introduce legacy STARBUILD conversion support in starbuild.rs

- Created `ConvertedStarbuild` and `ParsedStarbuild` structs to manage conversion data.
- Implemented `convert_starbuild_file` to parse STARBUILD files and generate package specifications.
- Added functions to handle parsing of various STARBUILD constructs, including dependencies and build phases.
- Developed a build script generator for STARBUILD, supporting custom install functions.
- Included tests to validate conversion of single and multi-output STARBUILD files.

Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "depot"
-version = "0.31.0"
+version = "0.31.1"
 edition = "2024"
 
 [lints.rust]
@@ -27,7 +27,7 @@ toml = "1.0.6"
 url = "2.5.8"
 walkdir = "2.5.0"
 xz2 = "0.1.7"
-zip = "8.3.1"
+zip = "8.4.0"
 zstd = { version = "0.13.3", features = ["zstdmt"] }
 inquire = "0.9.4"
 md5 = "0.8.0"