feat: add volcengine dns api

[wenxuan70]

This PR adds support for Volcengine DNS API https://console.volcengine.com/TrafficRoute/dns/publiczone/zones with docs at https://www.volcengine.com/docs/6758/155086.

Features

• Add TXT records for ACME challenge
• Remove TXT records after validation

Testing

• Tested with staging and production environment
• Tested certificate issuance
• Tested automatic renewal

Usage

export Volcengine_ACCESS_KEY_ID="your_access_key"
export Volcengine_SECRET_ACCESS_KEY="your_secret_access_key"
export Volcengine_SESSION_TOKEN="your_session_token"

acme.sh --issue -d example.com --dns dns_volcengine

I passed DNS-API-Test.

https://github.com/wenxuan70/acme.sh/actions/runs/20545618235

[github-actions]

Welcome
READ ME !!!!!
Read me !!!!!!
First thing: don't send PR to the master branch, please send to the dev branch instead.
Please read the DNS API Dev Guide.
You MUST pass the DNS-API-Test.
Then reply on this message, otherwise, your code will not be reviewed or merged.
Please also make sure to add/update the usage here: https://github.com/acmesh-official/acme.sh/wiki/dnsapi2
注意: 必须通过了 DNS-API-Test 才会被 review. 无论是修改, 还是新加的 dns api, 都必须确保通过这个测试.

[neilpang]

Please read the DNS API Dev Guide.

[wenxuan70]

Okay, let me check the documentation to see if there is anything missing in PR.