Add ZSTD wrapper library

[mateeullahmalik]

Ref: LumeraProtocol/supernode#236

[Copilot]

Pull request overview

This PR migrates from the pure Go klauspost/compress/zstd library to the CGO-based DataDog/zstd library wrapper, which provides bindings to the official C zstd implementation. The change simplifies the compression logic by using direct CompressLevel calls instead of managing encoders.

Key Changes:

• Replaced klauspost/compress/zstd with DataDog/zstd CGO wrapper
• Simplified ZstdCompress and HighCompress functions to use direct compression calls
• Removed multi-threaded compression logic from HighCompress function

Reviewed changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
go.mod	Moved github.com/DataDog/zstd v1.5.7 from indirect to direct dependency and moved github.com/klauspost/compress v1.18.0 to indirect dependencies
x/action/v1/keeper/crypto.go	Replaced klauspost/compress/zstd with DataDog/zstd, simplified compression functions to use CompressLevel API, removed unused imports (bytes, io, runtime)

---

💡 Add Copilot custom instructions for smarter, more guided reviews. Learn how to get started.

[roomote-v0]

Rooviewer   See task on Roo Cloud

I've reviewed the changes. The HighCompress function now utilizes the semaphore, but the function itself appears to be unused in the codebase. The CGO dependency issue also remains unaddressed.

• Address CGO dependency concerns in go.mod
• Clean up unused constants and imports in x/action/v1/keeper/crypto.go
• Remove or document unused HighCompress function

Previous reviews

• 405e268: Review #1

_{Mention @roomote in a comment to request specific changes to this pull request or fix all unresolved issues.}