feat(core): sign hook payload data

[xiaoyijun]

Summary

This PR contains the following updates:

• Add a sign util to sign payload data
• Sign hook payload if the hook's signing key is available

Testing

UT & IT & Test locally.

Test with the go sample and get the correct signature

Checklist

• .changeset
• unit tests
• integration tests
• docs

OR

• This PR is not applicable for the checklist

[linear]

LOG-6073 Core: Signing Hooks Payload Data

https://www.notion.so/silverhand/Generate-Webhook-Signature-41e0f4989d2944aebab78d640d1f2edb

• 我们目前允许用户自定义 Request Headers, 如果自定义的 Key 和 我们用的 x-logto-signature-256 一样，要怎么处理

[github-actions]

COMPARE TO master

Total Size Diff 📈 +3.85 KB

Diff by File

Name	Diff
packages/core/src/libraries/hook.test.ts	📈 +196 Bytes
packages/core/src/libraries/hook.ts	📈 +196 Bytes
packages/core/src/utils/sign.test.ts	📈 +735 Bytes
packages/core/src/utils/sign.ts	📈 +283 Bytes
packages/integration-tests/src/helpers/index.ts	📈 +141 Bytes
packages/integration-tests/src/tests/api/hooks.test.ts	📈 +2.33 KB

[simeng-li]

P.S. should we update the integration test to check the header as well?

[xiaoyijun]

P.S. should we update the integration test to check the header as well?

A test for webhook signature is added.
@simeng-li

[simeng-li]

overall LGTM