chore: add license for libzstd

[yiweichi]

Purpose or design rationale of this PR

Describe your change. Make sure to answer these three questions: What does this PR do? Why does it do it? How does it do it?

This PR adds license MIT OR Apache-2.0 for crate libzstd. It helps reth repo passing the CI check.

PR title

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• build: Changes that affect the build system or external dependencies (example scopes: yarn, eslint, typescript)
• ci: Changes to our CI configuration files and scripts (example scopes: vercel, github, cypress)
• docs: Documentation-only changes
• feat: A new feature
• fix: A bug fix
• perf: A code change that improves performance
• refactor: A code change that doesn't fix a bug, or add a feature, or improves performance
• style: Changes that do not affect the meaning of the code (white-space, formatting, missing semi-colons, etc)
• test: Adding missing tests or correcting existing tests

Breaking change label

Does this PR have the breaking-change label?

• No, this PR is not a breaking change
• Yes

Summary by CodeRabbit

• Chores
  • Updated license information in package manifests for improved clarity on licensing terms.

[coderabbitai]

Walkthrough

The license field was added to the Cargo.toml manifests for both the encoder-legacy and encoder-standard Rust packages, specifying "MIT OR Apache-2.0" as the licensing terms. No other modifications to functionality, dependencies, or configuration were made.

Changes

Cohort / File(s)	Change Summary
Cargo.toml License Field Addition libzstd/encoder-legacy/Cargo.toml, libzstd/encoder-standard/Cargo.toml	Added license = "MIT OR Apache-2.0" to each Cargo.toml manifest. No other changes.

Estimated code review effort

🎯 1 (Trivial) | ⏱️ ~2 minutes

Poem

Two crates now wear their license proud,
MIT or Apache—declared out loud.
No code has changed, no logic bent,
Just words of law, with good intent.
The bunnies hop, their work is done—
Open source joy for everyone! 🐇✨

Note

⚡️ Unit Test Generation is now available in beta!

Learn more here, or try it out under "Finishing Touches" below.

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📜 Recent review details

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Review profile: CHILL
Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between 2cfec8c and 2ed98a7.

📒 Files selected for processing (2)

• libzstd/encoder-legacy/Cargo.toml (1 hunks)
• libzstd/encoder-standard/Cargo.toml (1 hunks)

🔇 Additional comments (2)

libzstd/encoder-legacy/Cargo.toml (1)

5-5: License declaration LGTM

The SPDX‐compatible expression looks correct and unblocks CI. 👍

libzstd/encoder-standard/Cargo.toml (1)

5-5: License declaration LGTM

Same as in encoder-legacy; the crate now clearly states dual MIT / Apache-2.0 licensing.

✨ Finishing Touches

🧪 Generate unit tests

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch add-license-for-libzstd

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[yiweichi]

Not sure If we want to add a license for it. If not we can bypass it on the Reth CI part.