chore: add oss licenses

[SamMorrowDrums]

Adds:

• open source licenses
• summary in markdown
• script to re-generate
• action that will fail when they are not up-to-date

The added files/folders include licences, notices and source code where the license indicates that this is required for distribution.

It's also important to note that builds for different operating systems produce different licenses in certain circumstances, so we will likely want to produce the correct set for each OS build and provide the files as part of the specific release bundle.

[Copilot]

Pull Request Overview

This PR introduces OSS licenses to the repository along with documentation and automation to keep these licenses up-to-date. Key changes include:

• The addition of several configuration files for CI setups (Appveyor, Travis, and GitHub Actions).
• New markdown files listing third-party OSS dependencies.
• An automation script and GitHub workflow to enforce license checks.

Reviewed Changes

Copilot reviewed 215 out of 228 changed files in this pull request and generated 1 comment.

Show a summary per file

File	Description
third-party/github.com/hashicorp/hcl/appveyor.yml	Adds a Windows CI configuration with build steps.
third-party/github.com/hashicorp/hcl/README.md	Introduces documentation for the HCL project including OSS info.
third-party/github.com/hashicorp/hcl/.travis.yml	Defines Go CI build steps using Travis CI.
third-party/github.com/hashicorp/hcl/.github/ISSUE_TEMPLATE.md	Provides an issue template for reporting problems.
third-party-licenses.md	Lists OSS dependencies and their licenses.
third-party-licenses.copy.md	Contains identical OSS dependency info as in third-party-licenses.md.
.github/workflows/license-check.yml	Adds a GitHub Action to run a license check script.

Files not reviewed (13)

• .github/licenses.tmpl: Language not supported
• script/licenses: Language not supported
• script/licenses-check: Language not supported
• third-party/github.com/aws/smithy-go/ptr/LICENSE: Language not supported
• third-party/github.com/aws/smithy-go/ptr/NOTICE: Language not supported
• third-party/github.com/fsnotify/fsnotify/LICENSE: Language not supported
• third-party/github.com/github/github-mcp-server/LICENSE: Language not supported
• third-party/github.com/google/go-github/v69/github/LICENSE: Language not supported
• third-party/github.com/google/go-querystring/query/LICENSE: Language not supported
• third-party/github.com/google/uuid/LICENSE: Language not supported
• third-party/github.com/hashicorp/hcl/.gitignore: Language not supported
• third-party/github.com/hashicorp/hcl/LICENSE: Language not supported
• third-party/github.com/hashicorp/hcl/Makefile: Language not supported

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