Add support for x509 SubjectAltName identification

[tonickkozlov]

Currently only CommonName of an X.509 certificate can be used to validate identity of a user.
This change extends support to include SubjectAltName extension as well.

With this change, a user can be defined as as

<user>
    <ssl_certificates>
        <subject_alt_name>URI:spiffe://foo.com/bar</subject_alt_name>
    </ssl_certificates>
</user>

Then a user would need to present the following info in its TLS certificate:

Certificate:
  Data: ...
    X509v3 extensions:
        X509v3 Subject Alternative Name:
            URI:spiffe://foo.com/bar

Few caveats:

• Only DNS and URI types of subjectAltName extension are supported
• Wildcard validation is not supported, it's not required by the standard

Changelog category (leave one):

• Improvement

Changelog entry (a user-readable short description of the changes that goes to CHANGELOG.md):

Add support for user identification based on x509 SubjectAltName extension.

Documentation entry for user-facing changes

• Documentation is written (mandatory for new features)

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---

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---

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[robot-ch-test-poll]

This is an automated comment for commit b1b9aaf with description of existing statuses. It's updated for the latest CI running

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Check name	Description	Status
Performance Comparison	Measure changes in query performance. The performance test report is described in detail here. In square brackets are the optional part/total tests	❌ failure
Stateless tests	Runs stateless functional tests for ClickHouse binaries built in various configurations -- release, debug, with sanitizers, etc	❌ failure
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[tonickkozlov]

@thevar1able thanks for taking a look at my PR. Does the overall approach look OK to you?

00626_replace_partition_from_table_zookeeper
This test failed with a timeout but it doesn't seem related to the change I'm making. Is there a chance it's flaky?

[thevar1able]

@tonickkozlov yep overall looks OK, I'll make another pass today. I will check the test as well.