feat: Build and Publish refactor

[Mqxx]

• Refactored the build and publish pipeline
• Changed JSR package structure
• Moved the commands needed for publish to their own dedicated sh files

[Copilot]

Pull request overview

This PR refactors how the C++ Linux bindings are built and published to JSR, moving to a reusable artifact-based pipeline and a new JSR package layout. It also adds CI workflows for C++ and Deno integration tests.

Changes:

• Introduced a new JSR package structure under jsr/ with a TypeScript entrypoint (src/bin/index.ts) and explicit jsr.json manifest.
• Replaced the previous in-place “embed binary” script with dedicated shell scripts for copying the built .so, converting it to JSON/base64, and stamping the JSR version.
• Added/updated GitHub Actions workflows to build the shared library once, publish a serialized binary to JSR via a reusable workflow, and run C++ and Deno integration tests.

Reviewed changes

Copilot reviewed 16 out of 19 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
jsr/src/bin/index.ts	Adds a TypeScript module that re-exports the serialized x86_64 binary JSON for consumers of @serial/cpp-bindings-linux/bin.
jsr/scripts/set_version.sh	Adds a helper script to inject the computed version into jsr/jsr.json before publishing.
jsr/scripts/copy_binary.sh	Adds a script to copy the built shared library into the JSR package’s bin/ directory.
jsr/scripts/binary_to_json.sh	Adds a script to convert the shared library into a base64-encoded JSON blob with metadata for JSR.
jsr/package/jsr.json.in	Removes the old CMake-templated JSR manifest used under the previous jsr/package structure.
jsr/package/README.md	Removes the legacy README associated with the old jsr/package layout.
jsr/package/.gitignore	Removes legacy ignore rules for the old jsr/package/jsr.json.
jsr/jsr.json	Introduces a new, version-stamped JSR manifest at the jsr/ root, exporting ./bin via src/bin/index.ts and defining publish include patterns.
jsr/README.md	Adds an updated README for the JSR package, including usage and CI badges.
jsr/LICENSE	Adds an LGPLv3 license file scoped to the JSR package.
jsr/.gitignore	Ignores generated binary artifacts under jsr/bin/ while allowing tracked sources under jsr/src/bin/.
CMakeLists.txt	Updates cmake_git_versioning to v1.1.0 and writes env.sh with PACKAGE_VERSION for use by CI workflows.
.github/workflows/publish_jsr.yml	Adds a reusable workflow that prepares artifacts (copy & JSON-encode the binary, set manifest version) and publishes or dry-runs deno publish.
.github/workflows/publish-jsr.yml	Removes the old, monolithic “build and publish to JSR” workflow in favor of the new artifact-based pipeline.
.github/workflows/deno_tests.yml	Adds a Deno-based integration test workflow that builds the project in a container and runs tests against a virtual serial port.
.github/workflows/cpp_tests.yml	Adds a Fedora-based C++ test workflow that builds the project and runs the cpp_bindings_linux_tests suite.
.github/workflows/build_binary.yml	Adds a dedicated workflow to build the shared library, capture PACKAGE_VERSION from env.sh, upload the .so artifact, and call the reusable publish_jsr workflow.
.github/workflows/build-deno-so.yml	Removes the old workflow that built and uploaded a Deno-targeted .so artifact, superseded by the new build-and-publish pipeline.

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