feat: support more ssl verify mode

[koarz]

What problem does this PR solve?

Issue Number: resolve
#297

Problem Summary:

Previously, after setting verify_depth, the default behavior was to use only the verification mode SSL_VERIFY_PEER | SSL_VERIFY_FAIL_IF_NO_PEER_CERT. It was not possible to use SSL_VERIFY_PEER alone. Therefore, we needed to add additional configuration to control this behavior. For this reason, a VerifyMode field was added to VerifyOptions, corresponding to the content of sslverify. Since OpenSSL’s verify options are defined as macros, the SSL_ prefix was removed to distinguish them.

What is changed and the side effects?

Changed:
The verify mode set in sslctx when verify_depth > 0

Side effects:

• Performance effects:

• Breaking backward compatibility:

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Check List:

• Please make sure your changes are compilable.
• When providing us with a new feature, it is best to add related tests.
• Please follow Contributor Covenant Code of Conduct.

[chenBright]

LGTM