Move all continuous integration to GitHub Actions

[jonkoops]

Moves all of the work done for CI to GitHub Actions, getting rid of Travis in the process.

[jonkoops]

I'll keep this PR in draft as the CI checks currently have some failures in them that we might want to resolve in separate PRs such as #940.

[Copilot]

Pull Request Overview

This PR migrates continuous integration from Travis to GitHub Actions. It introduces a composite action for setting up the workspace and defines multiple workflow jobs for linting, Node.js testing across a range of versions, browser testing, and benchmarking.

Reviewed Changes

Copilot reviewed 2 out of 4 changed files in this pull request and generated no comments.

File	Description
.github/actions/setup/action.yml	Adds a composite action to set up Node.js and install dependencies.
.github/workflows/main.yml	Defines CI workflow jobs for linting, testing, browser tests, and benchmarking.

Files not reviewed (2)

• .github/workflows/pr.yaml: Language not supported
• .travis.yml: Language not supported

[jonkoops]

I've decided to change the approach here, the matrix now includes all versions where we can get the tests to pass, which I think is a good starting point. Adding support for newer and older versions of Node.js can be handled as a follow-up under #941 and #944.

[Stuk]

Thank you! Couple of comments about the benchmarking code, wondering if you know the answers? If not we could remove this functionality for the moment.

[jonkoops]

I spent a bit more time to look through the docs, and decided to split off the benchmarks into a separate workflow that only runs on the main branch, as per the recommendations from the documentation.

[Copilot]

Pull Request Overview

This PR transfers the existing continuous integration process from Travis to GitHub Actions by implementing new workflow configurations and a reusable composite action for setting up the workspace.

• Added a main workflow (main.yml) for linting, Node.js testing, and browser testing.
• Introduced a benchmark workflow (benchmark.yml) to run and report performance benchmarks.
• Created a composite action (setup/action.yml) to standardize workspace setup across workflows.

Reviewed Changes

Copilot reviewed 3 out of 5 changed files in this pull request and generated no comments.

File	Description
.github/workflows/main.yml	Implements linting and tests (Node.js & browser) jobs.
.github/workflows/benchmark.yml	Adds a workflow to run benchmarks and manage results.
.github/actions/setup/action.yml	Defines a composite action to install Node.js and dependencies.

Files not reviewed (2)

• .github/workflows/pr.yaml: Language not supported
• .travis.yml: Language not supported