Version 0.51.0

What's Changed

• Libs: Implement Filtering by Channel by @svix-stephanie in #266
• Kotlin & Go: Support filtering by event type by @svix-frank in #270
• Libs: Support Idempotency-Key for Post Commands by @svix-stephanie in #264
• Add additional unit testing by @svix-daniel in #272
• JS: IdempotencyKey, default to empty string by @svix-frank in #273
• Bump version & update changelog by @svix-frank in #271
• Add missing changelog entry and reformat a bit. by @tasn in #276

Full Changelog: v0.50.0...v0.51.0