feat(json): Split out into its own crate

crates/libtest-json/CHANGELOG.md

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+# Change Log
+All notable changes to this project will be documented in this file.
+
+The format is based on [Keep a Changelog](http://keepachangelog.com/)
+and this project adheres to [Semantic Versioning](http://semver.org/).
+
+<!-- next-header -->
+## [Unreleased] - ReleaseDate
+
+<!-- next-url -->
+[Unreleased]: https://github.com/rust-cli/argfile/compare/c96ef27899b410f9f154183989d4ccf60af27da6...HEAD

crates/libtest-json/Cargo.toml

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+[package]
+name = "libtest-json"
+version = "0.1.0"
+description = "Definition of the json output for libtest"
+categories = ["development-tools::testing"]
+keywords = ["libtest"]
+repository.workspace = true
+license.workspace = true
+edition.workspace = true
+rust-version.workspace = true
+include.workspace = true
+
+[package.metadata.docs.rs]
+all-features = true
+rustdoc-args = ["--cfg", "docsrs", "--generate-link-to-definition"]
+
+[package.metadata.release]
+pre-release-replacements = [
+  {file="CHANGELOG.md", search="Unreleased", replace="{{version}}", min=1},
+  {file="CHANGELOG.md", search="\\.\\.\\.HEAD", replace="...{{tag_name}}", exactly=1},
+  {file="CHANGELOG.md", search="ReleaseDate", replace="{{date}}", min=1},
+  {file="CHANGELOG.md", search="<!-- next-header -->", replace="<!-- next-header -->\n## [Unreleased] - ReleaseDate\n", exactly=1},
+  {file="CHANGELOG.md", search="<!-- next-url -->", replace="<!-- next-url -->\n[Unreleased]: https://github.com/epage/pytest-rs/compare/{{tag_name}}...HEAD", exactly=1},
+]
+
+[features]
+default = []
+serde = ["dep:serde"]
+unstable-schema = ["serde", "dep:schemars", "dep:serde_json"]
+
+[dependencies]
+serde = { version = "1.0.160", features = ["derive"], optional = true }
+serde_json = { version = "1.0.96", optional = true }
+schemars = { version = "1.0.0-alpha.17", features = ["preserve_order", "semver1"], optional = true }
+
+[dev-dependencies]
+snapbox = "0.6.21"
+
+[lints]
+workspace = true