eKuiper 1.8.0-beta.1

What's Changed

• fix(function): add stats function for built-in function by @superrxan in #1593
• fix: metrics and optional server by @ngjaying in #1596
• fix(function): fix int validation to allow int64 and other int types by @ngjaying in #1597
• doc: reconstruct by @ngjaying in #1599
• doc updates by @ngjaying in #1601
• add go report card by @ngjaying in #1602
• fix(rule): must reload topo when rule start by @ngjaying in #1604
• fix(config): recover all rules when import data by @superrxan in #1605
• test(service): add unit test for service manager by @ngjaying in #1603

Full Changelog: 1.8.0-beta.0...1.8.0-beta.1