Feature/add mis endpoints in security

[bluepal-prasanthi-moparthi]

This PR includes the following Security - related endpoints:

1. GET - /_db/{database-name}/_admin/server/tls
2. POST - /_admin/server/tls
3. POST - /_admin/server/encryption

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[Copilot]

Pull Request Overview

This PR adds three new security-related administration endpoints to the ArangoDB Go driver v2: TLS data retrieval, TLS data reload, and encryption key rotation functionality.

Key changes:

• Added GetTLSData, ReloadTLSData, and RotateEncryptionAtRestKey methods to the ClientAdmin interface
• Implemented corresponding data structures for TLS configuration and encryption key metadata
• Added comprehensive test coverage for all three endpoints with proper error handling

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
v2/arangodb/client_admin.go	Defines new interface methods and data structures for TLS and encryption operations
v2/arangodb/client_admin_impl.go	Implements the three new security endpoint methods with proper HTTP handling
v2/tests/admin_test.go	Adds comprehensive test functions with graceful error handling and validation
v2/CHANGELOG.md	Documents the addition of security endpoints

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[Copilot]

The PEM format validation is overly simplistic and only checks for the BEGIN marker. Consider also checking for the corresponding END marker or use proper PEM parsing from the crypto/x509 package for more robust validation.